diff --git a/worlds/doom_1993/Items.py b/worlds/doom_1993/Items.py
index 3c5124d4..3dce3e01 100644
--- a/worlds/doom_1993/Items.py
+++ b/worlds/doom_1993/Items.py
@@ -650,8 +650,8 @@ item_table: Dict[int, ItemDict] = {
              'doom_type': 2006,
              'episode': -1,
              'map': -1},
-    350106: {'classification': ItemClassification.progression,
-             'count': 1,
+    350106: {'classification': ItemClassification.useful,
+             'count': 0,
              'name': 'Backpack',
              'doom_type': 8,
              'episode': -1,
@@ -1160,6 +1160,30 @@ item_table: Dict[int, ItemDict] = {
              'doom_type': 2026,
              'episode': 4,
              'map': 9},
+    350191: {'classification': ItemClassification.useful,
+             'count': 0,
+             'name': 'Bullet capacity',
+             'doom_type': 65001,
+             'episode': -1,
+             'map': -1},
+    350192: {'classification': ItemClassification.useful,
+             'count': 0,
+             'name': 'Shell capacity',
+             'doom_type': 65002,
+             'episode': -1,
+             'map': -1},
+    350193: {'classification': ItemClassification.useful,
+             'count': 0,
+             'name': 'Energy cell capacity',
+             'doom_type': 65003,
+             'episode': -1,
+             'map': -1},
+    350194: {'classification': ItemClassification.useful,
+             'count': 0,
+             'name': 'Rocket capacity',
+             'doom_type': 65004,
+             'episode': -1,
+             'map': -1},
 }
 
 
diff --git a/worlds/doom_1993/Options.py b/worlds/doom_1993/Options.py
index c9c61110..c741df38 100644
--- a/worlds/doom_1993/Options.py
+++ b/worlds/doom_1993/Options.py
@@ -1,4 +1,4 @@
-from Options import PerGameCommonOptions, Choice, Toggle, DeathLink, DefaultOnToggle, StartInventoryPool
+from Options import PerGameCommonOptions, Range, Choice, Toggle, DeathLink, DefaultOnToggle, StartInventoryPool
 from dataclasses import dataclass
 
 
@@ -144,6 +144,84 @@ class Episode4(Toggle):
     display_name = "Episode 4"
 
 
+class SplitBackpack(Toggle):
+    """Split the Backpack into four individual items, each one increasing ammo capacity for one type of weapon only."""
+    display_name = "Split Backpack"
+
+
+class BackpackCount(Range):
+    """How many Backpacks will be available.
+    If Split Backpack is set, this will be the number of each capacity upgrade available."""
+    display_name = "Backpack Count"
+    range_start = 0
+    range_end = 10
+    default = 1
+
+
+class MaxAmmoBullets(Range):
+    """Set the starting ammo capacity for bullets."""
+    display_name = "Max Ammo - Bullets"
+    range_start = 200
+    range_end = 999
+    default = 200
+
+
+class MaxAmmoShells(Range):
+    """Set the starting ammo capacity for shotgun shells."""
+    display_name = "Max Ammo - Shells"
+    range_start = 50
+    range_end = 999
+    default = 50
+
+
+class MaxAmmoRockets(Range):
+    """Set the starting ammo capacity for rockets."""
+    display_name = "Max Ammo - Rockets"
+    range_start = 50
+    range_end = 999
+    default = 50
+
+
+class MaxAmmoEnergyCells(Range):
+    """Set the starting ammo capacity for energy cells."""
+    display_name = "Max Ammo - Energy Cells"
+    range_start = 300
+    range_end = 999
+    default = 300
+
+
+class AddedAmmoBullets(Range):
+    """Set the amount of bullet capacity added when collecting a backpack or capacity upgrade."""
+    display_name = "Added Ammo - Bullets"
+    range_start = 20
+    range_end = 999
+    default = 200
+
+
+class AddedAmmoShells(Range):
+    """Set the amount of shotgun shell capacity added when collecting a backpack or capacity upgrade."""
+    display_name = "Added Ammo - Shells"
+    range_start = 5
+    range_end = 999
+    default = 50
+
+
+class AddedAmmoRockets(Range):
+    """Set the amount of rocket capacity added when collecting a backpack or capacity upgrade."""
+    display_name = "Added Ammo - Rockets"
+    range_start = 5
+    range_end = 999
+    default = 50
+
+
+class AddedAmmoEnergyCells(Range):
+    """Set the amount of energy cell capacity added when collecting a backpack or capacity upgrade."""
+    display_name = "Added Ammo - Energy Cells"
+    range_start = 30
+    range_end = 999
+    default = 300
+
+
 @dataclass
 class DOOM1993Options(PerGameCommonOptions):
     start_inventory_from_pool: StartInventoryPool
@@ -163,3 +241,14 @@ class DOOM1993Options(PerGameCommonOptions):
     episode3: Episode3
     episode4: Episode4
 
+    split_backpack: SplitBackpack
+    backpack_count: BackpackCount
+    max_ammo_bullets: MaxAmmoBullets
+    max_ammo_shells: MaxAmmoShells
+    max_ammo_rockets: MaxAmmoRockets
+    max_ammo_energy_cells: MaxAmmoEnergyCells
+    added_ammo_bullets: AddedAmmoBullets
+    added_ammo_shells: AddedAmmoShells
+    added_ammo_rockets: AddedAmmoRockets
+    added_ammo_energy_cells: AddedAmmoEnergyCells
+
diff --git a/worlds/doom_1993/__init__.py b/worlds/doom_1993/__init__.py
index b6138ae0..d459290f 100644
--- a/worlds/doom_1993/__init__.py
+++ b/worlds/doom_1993/__init__.py
@@ -42,7 +42,7 @@ class DOOM1993World(World):
     options: DOOM1993Options
     game = "DOOM 1993"
     web = DOOM1993Web()
-    required_client_version = (0, 3, 9)
+    required_client_version = (0, 5, 0)  # 1.2.0-prerelease or higher
 
     item_name_to_id = {data["name"]: item_id for item_id, data in Items.item_table.items()}
     item_name_groups = Items.item_name_groups
@@ -204,6 +204,15 @@ class DOOM1993World(World):
             count = item["count"] if item["name"] not in self.starting_level_for_episode else item["count"] - 1
             itempool += [self.create_item(item["name"]) for _ in range(count)]
 
+        # Backpack(s) based on options
+        if self.options.split_backpack.value:
+            itempool += [self.create_item("Bullet capacity") for _ in range(self.options.backpack_count.value)]
+            itempool += [self.create_item("Shell capacity") for _ in range(self.options.backpack_count.value)]
+            itempool += [self.create_item("Energy cell capacity") for _ in range(self.options.backpack_count.value)]
+            itempool += [self.create_item("Rocket capacity") for _ in range(self.options.backpack_count.value)]
+        else:
+            itempool += [self.create_item("Backpack") for _ in range(self.options.backpack_count.value)]
+
         # Place end level items in locked locations
         for map_name in Maps.map_names:
             loc_name = map_name + " - Exit"
@@ -265,7 +274,7 @@ class DOOM1993World(World):
         # Was balanced for 3 episodes (We added 4th episode, but keep same ratio)
         count = min(remaining_loc, max(1, int(round(self.items_ratio[item_name] * ep_count / 3))))
         if count == 0:
-            logger.warning("Warning, no ", item_name, " will be placed.")
+            logger.warning(f"Warning, no {item_name} will be placed.")
             return
 
         for i in range(count):
@@ -281,4 +290,14 @@ class DOOM1993World(World):
         # an older version, the player would end up stuck.
         slot_data["two_ways_keydoors"] = True
 
+        # Send slot data for ammo capacity values; this must be generic because Heretic uses it too
+        slot_data["ammo1start"] = self.options.max_ammo_bullets.value
+        slot_data["ammo2start"] = self.options.max_ammo_shells.value
+        slot_data["ammo3start"] = self.options.max_ammo_energy_cells.value
+        slot_data["ammo4start"] = self.options.max_ammo_rockets.value
+        slot_data["ammo1add"] = self.options.added_ammo_bullets.value
+        slot_data["ammo2add"] = self.options.added_ammo_shells.value
+        slot_data["ammo3add"] = self.options.added_ammo_energy_cells.value
+        slot_data["ammo4add"] = self.options.added_ammo_rockets.value
+
         return slot_data
diff --git a/worlds/doom_ii/Items.py b/worlds/doom_ii/Items.py
index fc426cc8..009e6034 100644
--- a/worlds/doom_ii/Items.py
+++ b/worlds/doom_ii/Items.py
@@ -56,8 +56,8 @@ item_table: Dict[int, ItemDict] = {
              'doom_type': 82,
              'episode': -1,
              'map': -1},
-    360007: {'classification': ItemClassification.progression,
-             'count': 1,
+    360007: {'classification': ItemClassification.useful,
+             'count': 0,
              'name': 'Backpack',
              'doom_type': 8,
              'episode': -1,
@@ -1058,6 +1058,30 @@ item_table: Dict[int, ItemDict] = {
              'doom_type': 2026,
              'episode': 4,
              'map': 2},
+    360600: {'classification': ItemClassification.useful,
+             'count': 0,
+             'name': 'Bullet capacity',
+             'doom_type': 65001,
+             'episode': -1,
+             'map': -1},
+    360601: {'classification': ItemClassification.useful,
+             'count': 0,
+             'name': 'Shell capacity',
+             'doom_type': 65002,
+             'episode': -1,
+             'map': -1},
+    360602: {'classification': ItemClassification.useful,
+             'count': 0,
+             'name': 'Energy cell capacity',
+             'doom_type': 65003,
+             'episode': -1,
+             'map': -1},
+    360603: {'classification': ItemClassification.useful,
+             'count': 0,
+             'name': 'Rocket capacity',
+             'doom_type': 65004,
+             'episode': -1,
+             'map': -1},
 }
 
 
diff --git a/worlds/doom_ii/Options.py b/worlds/doom_ii/Options.py
index 98c8ebc5..c8b0c9fb 100644
--- a/worlds/doom_ii/Options.py
+++ b/worlds/doom_ii/Options.py
@@ -1,6 +1,6 @@
 import typing
 
-from Options import PerGameCommonOptions, Choice, Toggle, DeathLink, DefaultOnToggle, StartInventoryPool
+from Options import PerGameCommonOptions, Range, Choice, Toggle, DeathLink, DefaultOnToggle, StartInventoryPool
 from dataclasses import dataclass
 
 
@@ -136,6 +136,84 @@ class SecretLevels(Toggle):
     display_name = "Secret Levels"
 
 
+class SplitBackpack(Toggle):
+    """Split the Backpack into four individual items, each one increasing ammo capacity for one type of weapon only."""
+    display_name = "Split Backpack"
+
+
+class BackpackCount(Range):
+    """How many Backpacks will be available.
+    If Split Backpack is set, this will be the number of each capacity upgrade available."""
+    display_name = "Backpack Count"
+    range_start = 0
+    range_end = 10
+    default = 1
+
+
+class MaxAmmoBullets(Range):
+    """Set the starting ammo capacity for bullets."""
+    display_name = "Max Ammo - Bullets"
+    range_start = 200
+    range_end = 999
+    default = 200
+
+
+class MaxAmmoShells(Range):
+    """Set the starting ammo capacity for shotgun shells."""
+    display_name = "Max Ammo - Shells"
+    range_start = 50
+    range_end = 999
+    default = 50
+
+
+class MaxAmmoRockets(Range):
+    """Set the starting ammo capacity for rockets."""
+    display_name = "Max Ammo - Rockets"
+    range_start = 50
+    range_end = 999
+    default = 50
+
+
+class MaxAmmoEnergyCells(Range):
+    """Set the starting ammo capacity for energy cells."""
+    display_name = "Max Ammo - Energy Cells"
+    range_start = 300
+    range_end = 999
+    default = 300
+
+
+class AddedAmmoBullets(Range):
+    """Set the amount of bullet capacity added when collecting a backpack or capacity upgrade."""
+    display_name = "Added Ammo - Bullets"
+    range_start = 20
+    range_end = 999
+    default = 200
+
+
+class AddedAmmoShells(Range):
+    """Set the amount of shotgun shell capacity added when collecting a backpack or capacity upgrade."""
+    display_name = "Added Ammo - Shells"
+    range_start = 5
+    range_end = 999
+    default = 50
+
+
+class AddedAmmoRockets(Range):
+    """Set the amount of rocket capacity added when collecting a backpack or capacity upgrade."""
+    display_name = "Added Ammo - Rockets"
+    range_start = 5
+    range_end = 999
+    default = 50
+
+
+class AddedAmmoEnergyCells(Range):
+    """Set the amount of energy cell capacity added when collecting a backpack or capacity upgrade."""
+    display_name = "Added Ammo - Energy Cells"
+    range_start = 30
+    range_end = 999
+    default = 300
+
+
 @dataclass
 class DOOM2Options(PerGameCommonOptions):
     start_inventory_from_pool: StartInventoryPool
@@ -153,3 +231,14 @@ class DOOM2Options(PerGameCommonOptions):
     episode2: Episode2
     episode3: Episode3
     episode4: SecretLevels
+
+    split_backpack: SplitBackpack
+    backpack_count: BackpackCount
+    max_ammo_bullets: MaxAmmoBullets
+    max_ammo_shells: MaxAmmoShells
+    max_ammo_rockets: MaxAmmoRockets
+    max_ammo_energy_cells: MaxAmmoEnergyCells
+    added_ammo_bullets: AddedAmmoBullets
+    added_ammo_shells: AddedAmmoShells
+    added_ammo_rockets: AddedAmmoRockets
+    added_ammo_energy_cells: AddedAmmoEnergyCells
diff --git a/worlds/doom_ii/__init__.py b/worlds/doom_ii/__init__.py
index 32c3cbd5..815e2141 100644
--- a/worlds/doom_ii/__init__.py
+++ b/worlds/doom_ii/__init__.py
@@ -43,7 +43,7 @@ class DOOM2World(World):
     options: DOOM2Options
     game = "DOOM II"
     web = DOOM2Web()
-    required_client_version = (0, 3, 9)
+    required_client_version = (0, 5, 0)  # 1.2.0-prerelease or higher
 
     item_name_to_id = {data["name"]: item_id for item_id, data in Items.item_table.items()}
     item_name_groups = Items.item_name_groups
@@ -196,6 +196,15 @@ class DOOM2World(World):
             count = item["count"] if item["name"] not in self.starting_level_for_episode else item["count"] - 1
             itempool += [self.create_item(item["name"]) for _ in range(count)]
 
+        # Backpack(s) based on options
+        if self.options.split_backpack.value:
+            itempool += [self.create_item("Bullet capacity") for _ in range(self.options.backpack_count.value)]
+            itempool += [self.create_item("Shell capacity") for _ in range(self.options.backpack_count.value)]
+            itempool += [self.create_item("Energy cell capacity") for _ in range(self.options.backpack_count.value)]
+            itempool += [self.create_item("Rocket capacity") for _ in range(self.options.backpack_count.value)]
+        else:
+            itempool += [self.create_item("Backpack") for _ in range(self.options.backpack_count.value)]
+
         # Place end level items in locked locations
         for map_name in Maps.map_names:
             loc_name = map_name + " - Exit"
@@ -258,11 +267,23 @@ class DOOM2World(World):
         # Was balanced based on DOOM 1993's first 3 episodes
         count = min(remaining_loc, max(1, int(round(self.items_ratio[item_name] * ep_count / 3))))
         if count == 0:
-            logger.warning("Warning, no ", item_name, " will be placed.")
+            logger.warning(f"Warning, no {item_name} will be placed.")
             return
 
         for i in range(count):
             itempool.append(self.create_item(item_name))
 
     def fill_slot_data(self) -> Dict[str, Any]:
-        return self.options.as_dict("difficulty", "random_monsters", "random_pickups", "random_music", "flip_levels", "allow_death_logic", "pro", "death_link", "reset_level_on_death", "episode1", "episode2", "episode3", "episode4")
+        slot_data = self.options.as_dict("difficulty", "random_monsters", "random_pickups", "random_music", "flip_levels", "allow_death_logic", "pro", "death_link", "reset_level_on_death", "episode1", "episode2", "episode3", "episode4")
+
+        # Send slot data for ammo capacity values; this must be generic because Heretic uses it too
+        slot_data["ammo1start"] = self.options.max_ammo_bullets.value
+        slot_data["ammo2start"] = self.options.max_ammo_shells.value
+        slot_data["ammo3start"] = self.options.max_ammo_energy_cells.value
+        slot_data["ammo4start"] = self.options.max_ammo_rockets.value
+        slot_data["ammo1add"] = self.options.added_ammo_bullets.value
+        slot_data["ammo2add"] = self.options.added_ammo_shells.value
+        slot_data["ammo3add"] = self.options.added_ammo_energy_cells.value
+        slot_data["ammo4add"] = self.options.added_ammo_rockets.value
+
+        return slot_data
diff --git a/worlds/heretic/Items.py b/worlds/heretic/Items.py
index a0907a3a..777bf06c 100644
--- a/worlds/heretic/Items.py
+++ b/worlds/heretic/Items.py
@@ -50,8 +50,8 @@ item_table: Dict[int, ItemDict] = {
              'doom_type': 2004,
              'episode': -1,
              'map': -1},
-    370006: {'classification': ItemClassification.progression,
-             'count': 1,
+    370006: {'classification': ItemClassification.useful,
+             'count': 0,
              'name': 'Bag of Holding',
              'doom_type': 8,
              'episode': -1,
@@ -1592,6 +1592,42 @@ item_table: Dict[int, ItemDict] = {
              'doom_type': 35,
              'episode': 5,
              'map': 9},
+    370600: {'classification': ItemClassification.useful,
+             'count': 0,
+             'name': 'Crystal Capacity',
+             'doom_type': 65001,
+             'episode': -1,
+             'map': -1},
+    370601: {'classification': ItemClassification.useful,
+             'count': 0,
+             'name': 'Ethereal Arrow Capacity',
+             'doom_type': 65002,
+             'episode': -1,
+             'map': -1},
+    370602: {'classification': ItemClassification.useful,
+             'count': 0,
+             'name': 'Claw Orb Capacity',
+             'doom_type': 65003,
+             'episode': -1,
+             'map': -1},
+    370603: {'classification': ItemClassification.useful,
+             'count': 0,
+             'name': 'Rune Capacity',
+             'doom_type': 65004,
+             'episode': -1,
+             'map': -1},
+    370604: {'classification': ItemClassification.useful,
+             'count': 0,
+             'name': 'Flame Orb Capacity',
+             'doom_type': 65005,
+             'episode': -1,
+             'map': -1},
+    370605: {'classification': ItemClassification.useful,
+             'count': 0,
+             'name': 'Mace Sphere Capacity',
+             'doom_type': 65006,
+             'episode': -1,
+             'map': -1},
 }
 
 
diff --git a/worlds/heretic/Options.py b/worlds/heretic/Options.py
index 7d98207b..fe64f587 100644
--- a/worlds/heretic/Options.py
+++ b/worlds/heretic/Options.py
@@ -1,4 +1,4 @@
-from Options import PerGameCommonOptions, Choice, Toggle, DeathLink, DefaultOnToggle, StartInventoryPool
+from Options import PerGameCommonOptions, Range, Choice, Toggle, DeathLink, DefaultOnToggle, StartInventoryPool
 from dataclasses import dataclass
 
 
@@ -144,6 +144,116 @@ class Episode5(Toggle):
     display_name = "Episode 5"
 
 
+class SplitBagOfHolding(Toggle):
+    """Split the Bag of Holding into six individual items, each one increasing ammo capacity for one type of weapon only."""
+    display_name = "Split Bag of Holding"
+
+
+class BagOfHoldingCount(Range):
+    """How many Bags of Holding will be available.
+    If Split Bag of Holding is set, this will be the number of each capacity upgrade available."""
+    display_name = "Bag of Holding Count"
+    range_start = 0
+    range_end = 10
+    default = 1
+
+
+class MaxAmmoCrystals(Range):
+    """Set the starting ammo capacity for crystals (Elven Wand ammo)."""
+    display_name = "Max Ammo - Crystals"
+    range_start = 100
+    range_end = 999
+    default = 100
+
+
+class MaxAmmoArrows(Range):
+    """Set the starting ammo capacity for arrows (Ethereal Crossbow ammo)."""
+    display_name = "Max Ammo - Arrows"
+    range_start = 50
+    range_end = 999
+    default = 50
+
+
+class MaxAmmoClawOrbs(Range):
+    """Set the starting ammo capacity for claw orbs (Dragon Claw ammo)."""
+    display_name = "Max Ammo - Claw Orbs"
+    range_start = 200
+    range_end = 999
+    default = 200
+
+
+class MaxAmmoRunes(Range):
+    """Set the starting ammo capacity for runes (Hellstaff ammo)."""
+    display_name = "Max Ammo - Runes"
+    range_start = 200
+    range_end = 999
+    default = 200
+
+
+class MaxAmmoFlameOrbs(Range):
+    """Set the starting ammo capacity for flame orbs (Phoenix Rod ammo)."""
+    display_name = "Max Ammo - Flame Orbs"
+    range_start = 20
+    range_end = 999
+    default = 20
+
+
+class MaxAmmoSpheres(Range):
+    """Set the starting ammo capacity for spheres (Firemace ammo)."""
+    display_name = "Max Ammo - Spheres"
+    range_start = 150
+    range_end = 999
+    default = 150
+
+
+class AddedAmmoCrystals(Range):
+    """Set the amount of crystal capacity gained when collecting a bag of holding or a capacity upgrade."""
+    display_name = "Added Ammo - Crystals"
+    range_start = 10
+    range_end = 999
+    default = 100
+
+
+class AddedAmmoArrows(Range):
+    """Set the amount of arrow capacity gained when collecting a bag of holding or a capacity upgrade."""
+    display_name = "Added Ammo - Arrows"
+    range_start = 5
+    range_end = 999
+    default = 50
+
+
+class AddedAmmoClawOrbs(Range):
+    """Set the amount of claw orb capacity gained when collecting a bag of holding or a capacity upgrade."""
+    display_name = "Added Ammo - Claw Orbs"
+    range_start = 20
+    range_end = 999
+    default = 200
+
+
+class AddedAmmoRunes(Range):
+    """Set the amount of rune capacity gained when collecting a bag of holding or a capacity upgrade."""
+    display_name = "Added Ammo - Runes"
+    range_start = 20
+    range_end = 999
+    default = 200
+
+
+class AddedAmmoFlameOrbs(Range):
+    """Set the amount of flame orb capacity gained when collecting a bag of holding or a capacity upgrade."""
+    display_name = "Added Ammo - Flame Orbs"
+    range_start = 2
+    range_end = 999
+    default = 20
+
+
+class AddedAmmoSpheres(Range):
+    """Set the amount of sphere capacity gained when collecting a bag of holding or a capacity upgrade."""
+    display_name = "Added Ammo - Spheres"
+    range_start = 15
+    range_end = 999
+    default = 150
+
+
 @dataclass
 class HereticOptions(PerGameCommonOptions):
     start_inventory_from_pool: StartInventoryPool
@@ -163,3 +273,18 @@ class HereticOptions(PerGameCommonOptions):
     episode3: Episode3
     episode4: Episode4
     episode5: Episode5
+
+    split_bag_of_holding: SplitBagOfHolding
+    bag_of_holding_count: BagOfHoldingCount
+    max_ammo_crystals: MaxAmmoCrystals
+    max_ammo_arrows: MaxAmmoArrows
+    max_ammo_claw_orbs: MaxAmmoClawOrbs
+    max_ammo_runes: MaxAmmoRunes
+    max_ammo_flame_orbs: MaxAmmoFlameOrbs
+    max_ammo_spheres: MaxAmmoSpheres
+    added_ammo_crystals: AddedAmmoCrystals
+    added_ammo_arrows: AddedAmmoArrows
+    added_ammo_claw_orbs: AddedAmmoClawOrbs
+    added_ammo_runes: AddedAmmoRunes
+    added_ammo_flame_orbs: AddedAmmoFlameOrbs
+    added_ammo_spheres: AddedAmmoSpheres
diff --git a/worlds/heretic/Rules.py b/worlds/heretic/Rules.py
index 579fd8b7..492b8f38 100644
--- a/worlds/heretic/Rules.py
+++ b/worlds/heretic/Rules.py
@@ -695,13 +695,11 @@ def set_episode5_rules(player, multiworld, pro):
         state.has("Phoenix Rod", player, 1) and
         state.has("Firemace", player, 1) and
         state.has("Hellstaff", player, 1) and
-        state.has("Gauntlets of the Necromancer", player, 1) and
-        state.has("Bag of Holding", player, 1))
+        state.has("Gauntlets of the Necromancer", player, 1))
 
     # Skein of D'Sparil (E5M9)
     set_rule(multiworld.get_entrance("Hub -> Skein of D'Sparil (E5M9) Main", player), lambda state:
         state.has("Skein of D'Sparil (E5M9)", player, 1) and
-        state.has("Bag of Holding", player, 1) and
         state.has("Hellstaff", player, 1) and
         state.has("Phoenix Rod", player, 1) and
         state.has("Dragon Claw", player, 1) and
diff --git a/worlds/heretic/__init__.py b/worlds/heretic/__init__.py
index bc0a5469..14b7ca49 100644
--- a/worlds/heretic/__init__.py
+++ b/worlds/heretic/__init__.py
@@ -41,7 +41,7 @@ class HereticWorld(World):
     options: HereticOptions
     game = "Heretic"
     web = HereticWeb()
-    required_client_version = (0, 3, 9)
+    required_client_version = (0, 5, 0)  # 1.2.0-prerelease or higher
 
     item_name_to_id = {data["name"]: item_id for item_id, data in Items.item_table.items()}
     item_name_groups = Items.item_name_groups
@@ -206,6 +206,17 @@ class HereticWorld(World):
             count = item["count"] if item["name"] not in self.starting_level_for_episode else item["count"] - 1
             itempool += [self.create_item(item["name"]) for _ in range(count)]
 
+        # Bag(s) of Holding based on options
+        if self.options.split_bag_of_holding.value:
+            itempool += [self.create_item("Crystal Capacity") for _ in range(self.options.bag_of_holding_count.value)]
+            itempool += [self.create_item("Ethereal Arrow Capacity") for _ in range(self.options.bag_of_holding_count.value)]
+            itempool += [self.create_item("Claw Orb Capacity") for _ in range(self.options.bag_of_holding_count.value)]
+            itempool += [self.create_item("Rune Capacity") for _ in range(self.options.bag_of_holding_count.value)]
+            itempool += [self.create_item("Flame Orb Capacity") for _ in range(self.options.bag_of_holding_count.value)]
+            itempool += [self.create_item("Mace Sphere Capacity") for _ in range(self.options.bag_of_holding_count.value)]
+        else:
+            itempool += [self.create_item("Bag of Holding") for _ in range(self.options.bag_of_holding_count.value)]
+
         # Place end level items in locked locations
         for map_name in Maps.map_names:
             loc_name = map_name + " - Exit"
@@ -274,7 +285,7 @@ class HereticWorld(World):
         episode_count = self.get_episode_count()
         count = min(remaining_loc, max(1, self.items_ratio[item_name] * episode_count))
         if count == 0:
-            logger.warning("Warning, no " + item_name + " will be placed.")
+            logger.warning(f"Warning, no {item_name} will be placed.")
             return
 
         for i in range(count):
@@ -290,4 +301,18 @@ class HereticWorld(World):
         slot_data["episode4"] = self.included_episodes[3]
         slot_data["episode5"] = self.included_episodes[4]
 
+        # Send slot data for ammo capacity values; this must be generic because Doom uses it too
+        slot_data["ammo1start"] = self.options.max_ammo_crystals.value
+        slot_data["ammo2start"] = self.options.max_ammo_arrows.value
+        slot_data["ammo3start"] = self.options.max_ammo_claw_orbs.value
+        slot_data["ammo4start"] = self.options.max_ammo_runes.value
+        slot_data["ammo5start"] = self.options.max_ammo_flame_orbs.value
+        slot_data["ammo6start"] = self.options.max_ammo_spheres.value
+        slot_data["ammo1add"] = self.options.added_ammo_crystals.value
+        slot_data["ammo2add"] = self.options.added_ammo_arrows.value
+        slot_data["ammo3add"] = self.options.added_ammo_claw_orbs.value
+        slot_data["ammo4add"] = self.options.added_ammo_runes.value
+        slot_data["ammo5add"] = self.options.added_ammo_flame_orbs.value
+        slot_data["ammo6add"] = self.options.added_ammo_spheres.value
+
         return slot_data