Bag of Crafting

Item Icon
Pickup Quote	"Make your destiny"
Entity ID	5.100.710
Recharge Time	Unlimited
Item Pool	Treasure Room Treasure Room
Quality	4
Item Tags
Collection Grid	(page 6, column 18, row 5)
Unlock Method	Defeat Delirium as Tainted Cain

Bag of Crafting is an unlockable activated item added in The Binding of Isaac: Repentance.

Effects

• Upon use, pressing an attack direction will cause a swipe attack with high knockback and 3 damage.
  • The swipe scales in size with Isaac's size.
  • The swipe will appear further from Isaac the higher his range is.
  • The swipe can be used to open Spiked Chests and Mimic Chests without taking damage.
  • The swipe can be used to block bullets.
• Swiping a pickup on the floor will add it to the bag. The bag's contents cannot be dropped. Up to 8 pickups can be stored.
  • Double pickups like Double Hearts will add two copies to the bag. Blended hearts will add one red heart and one soul heart.
  • Sticky nickels can't be picked up unless unstuck.
  • Chests and sacks can't be picked up, but can be opened with a swipe even behind obstacles.
  • If the player has enough money to buy a pickup from a shop, using Bag of Crafting on that pickup will purchase it and automatically add it to the bag.
• Once 8 pickups are held in the bag, the bag can be used once more to spawn an item pedestal.
  • If a recipe would result in an item that hasn't yet been unlocked, a random item will be crafted instead, except for fixed recipes, which always give you the same item, whether unlocked or not
• There are a total of 29 different types of consumables that can be placed in the bag. The ordering does not matter for the outcome.

As Tainted Cain:

• If pickups are collected after the max of 8 is reached, the contents shift left and up, deleting the top left slot and adding at the bottom right. Tapping the switch key cycles the bag's contents left and up in a loop, making it possible to choose which pickup to overwrite.
• Once 8 pickups are held in the bag, the bag will show a preview what would be crafted. Holding down the Use Pill/Card button will craft the item and place it directly in Tainted Cain's inventory.
  • Crafting an activated item while already holding one will turn the old one into pickups like collecting it would.
  • Curse of the Blind hides the crafting preview.

Component Types and Qualities

The cumulative quality of the components impacts the quality of the item received. The pickups belonging to each component type and their qualities are listed as below. The item received can be from the Treasure Room item pool (1× chance), Shop item pool (2× chance), Boss Room item pool (2× chance), or one of the pools listed in the table below. The pools in the table below require at least 1 of the corresponding component. For example, Devil Room items require at least 1 Black Heart.

If the recipe chooses an item from Devil, Angel, or Secret Room pools, the total component quality is lowered by 5 before the resulting item quality, and consequently the resulting item, is determined.

Name	Quality	Notes
Poop Nugget	0	Adds a chance of getting a Shell Game item. The chance increases by 10× per component.
Penny	1
Red Heart (full, half, or scared)	1
Rotten Heart	1	Adds a chance of getting a Curse Room item. The chance increases by 10× per component.
Bomb	2
Card	2	Includes Emergency Contact.
Cracked Key	2	Adds a chance of getting a Red Chest item. The chance increases by 10× per component.
Key	2
Micro Battery	2
Pill	2
Nickel (regular and sticky)	3
Dice Shard	4
Lil' Battery	4
Rune (includes Soul Stones)	4	Adds chance of getting a Planetarium item if the bag doesn't contain a Penny, Bomb, Key, or Red Heart. The chance increases by 10× per component.
Soul Heart (full or half)	4
Black Heart	5	Adds a chance of getting a Devil Room item. The chance increases by 10× per component.
Bone Heart	5	Adds a chance of getting a Secret Room item. The chance increases by 5× per component.
Charged Key	5
Dime	5
Eternal Heart	5	Adds a chance of getting an Angel Room item. The chance increases by 10× per component.
Gold Heart	5	Adds a chance of getting a Golden Chest item. The chance increases by 10× per component.
Golden Battery	7
Golden Bomb	7
Golden Key	7
Golden Penny	7
Golden Pill	7
Lucky Penny	8
Mega Battery	8
Giga Bomb	10

Total Components Quality		Resulting Item Quality Range
Special pools	Other pools
40+	35+	4-4
36-39	31-34	3-4
32-35	27-30	2-4
28-31	23-26	1-4
24-27	19-22	1-3
20-23	15-18	1-2
14-19	9-14	0-2
8-13	8	0-1

• 'Special Pools' are defined for this chart as Angel Room, Devil Room, and Secret Room item pools.

Interactions

• Car Battery: No effect.
• Wild Card: Holding up Bag of Crafting counts as an active item use for Wild Card, and can be replicated.

Recipes

Bag of Crafting's recipes are based on seed, but there are some fixed recipes that exist in every run. These items don't need to be unlocked to be crafted.

Uncraftable Items

These items have no recipes and cannot be crafted using the Bag of Crafting.^{[Check ingame]}

• Ball of Bandages
• Blood Bag
• Broken Glass Cannon
• Broken Shovel
• Broken Shovel
• Crystal Ball
• Cube of Meat
• Dad's Note
• Dogma
• A Dollar
• Head of Krampus
• Head of the Keeper
• Hold
• IV Bag
• Key Piece 1
• Key Piece 2
• Knife Piece 1
• Knife Piece 2
• A Lump of Coal
• Mom's Shovel
• The Negative
• The Polaroid
• A Pony
• Recall
• Redemption
• Skatole
• The Small Rock
• Steven
• Wait What?
• White Pony
• Glitch items created by TMTRAINER or Corrupted Data

Trivia

• There are $\left(\!\!\binom{29}{8}\!\!\right) = \binom{29+8-1}{8} = 30,260,340$, or about 30.3 million, combinations of pickups and consumables that can be used in the Bag of Crafting. The item chosen is based on a formula mapping the chosen consumables, item weights, and quality values into a single outcome. On average, about 1/4th of all items will represent over 1/2 of all recipes
  • This means, obviously, that there are numerous combinations that all match the same item and listing them all will not be possible.
  • Bag of Crafting can craft itself, which allows Tainted Cain (or a character with Schoolbag) to hold two at once.
• The average consumable value is ~4.31.
• This item was hinted at by Edmund McMillen before Repentance's release, calling it "The Bag" and hoped that players wouldn't figure it out quickly.

Bugs

Bug!	After using to revert the bag state, result preview shows nothing.

Bug!	If Tainted Cain dies in the exit of the Mines / Ashpit II Knife Piece 2 area in multiplayer mode and then gets revived, Bag of crafting will remain inactive, making it impossible for Tainted Cain to obtain any more items.

Bug!	Swinging Bag of Crafting while holding Evil Eye may create evil eye tears in the direction fired. Upon pressing the fire buttons, these tears will create a swing identical to that of the Bag of Crafting, even removing pickups caught in the swing. Pickups removed this way will NOT be added to the bag.

References

The Binding of Isaac: Rebirth
Achievements Challenges Completion Marks Items Trinkets Characters Chapters Rooms Transformations Attributes Bosses Monsters Pickups Modes Curses Objects Seeds Effects Endings
Collection Item Pools Version History Modding Music