Bag of Crafting

"Make your destiny"
Entity ID	5.100.710
Recharge Time	Unlimited
Item Pool	None
Unlock Method	Defeat Delirium as Tainted Cain

Bag of Crafting is an activated item added in The Binding of Isaac: Repentance. It is available solely for Tainted Cain as his starting item.

Effects

• Upon use, pressing an attack direction will cause a swipe attack with high knockback and 3 damage.
  • The swipe scales in size with Tainted Cain's size.
  • The swipe will appear further from Tainted Cain 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 any pickup on the floor will add them to the bag. The bag's contents cannot be dropped. Up to 8 pickups can be stored and if more are collected, 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.
  • 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.
• Once 8 pickups are held in the bag, the bag will show a preview what would be crafted by holding down the Use Pill/Card button.
  • Crafting an activated item while already holding one will turn the old one into pickups like collecting it would.
  • If a recipe would result in an item that hasn't yet been unlocked, Breakfast will be crafted instead.
  • Curse of the Blind hides the crafting preview.
• There are a total of 25 different types of consumables that can be placed in the bag. The ordering does not matter for the outcome.

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, starting from top left and counting right and down. The item received can be from the Treasure Room (Item Pool) (1× chance), Shop (Item Pool) (2× chance), Boss (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 recipes 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	Rarity	Notes
Empty slot	N/A	N/A
Red heart (full, half, or scared)	1	Common
Soul heart (full or half)	4	Uncommon
Black heart	5	Rare	Adds a chance of getting a Devil Room item. The chance increases by 10× per component.
Eternal heart	5	Rare	Adds a chance of getting an Angel Room item. The chance increases by 10× per component.
Gold heart	5	Rare	Adds a chance of getting a Golden Chest item. The chance increases by 10× per component.
Bone heart	5	Rare	Adds a chance of getting a Secret Room item. The chance increases by 5× per component.
Rotten heart	1	Rare	Adds a chance of getting a Curse Room item. The chance increases by 10× per component.
Penny or golden penny	1	Very common
Nickel or sticky nickel	3	Uncommon
Dime	5	Rare
Lucky penny	8	Rare
Key	2	Common
Golden key	5	Rare
Charged key	5	Rare
Bomb	2	Common
Golden bomb	6	Rare
Giga bomb	10	Very rare
Micro battery or golden battery	2	Rare
Lil' battery	4	Rare
Mega battery	8	Very rare
Card or Emergency Contact	2	Uncommon
Pill	2	Uncommon
Rune or soul stone	4	Rare	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.
Dice Shard	4	Very rare
Cracked Key	2	Very rare	Adds a chance of getting a Red Chest item. The chance increases by 10× per component.

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

Recipes

A list of recipes for every craftable item using the most common components is available as a separate article.

Uncraftable Items

These items have no recipes and cannot be crafted using the Bag of Crafting.

• Ball of Bandages
• Bag of Crafting
• Blood Bag
• Broken Glass Cannon
• Broken Shovel
• Broken Shovel
• C Section
• Crystal Ball
• Cube of Meat
• Dad's Note
• Dogma
• A Dollar
• Flip
• 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
• Sumptorium
• Tammy's Head
• Wait What?
• White Pony
• Glitch items created by TMTRAINER or Corrupted Data

Trivia

• There are $\left(\!\!{\binom {25}{8}}\!\!\right)={\binom {25+8-1}{8}}=10,518,300$, or about 10.5 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.
  • This means, obviously, that there are numerous combinations that all match the same item and listing them all will not be possible.
• The average consumable value is 3.78125.
• 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.
• The item is unavailable for anyone except Tainted Cain.
  • Despite this, it can be "unlocked" for all characters by defeating Delirium as Tainted Cain. Since no item pools contain it, however, the bag cannot actually be obtained by anyone else. It is currently unknown if this unlock has any practical effect.
  • Bag of Crafting can be dropped when Tainted Cain take damage while holding Butter!. That means other characters can pick it up that way; however, Tainted Cain is unable to pick it up again and is no longer able to obtain items.
  • Getting the Bag of Crafting as other characters still allows you to craft items. The special UI of the recipe doesn't appear, however. The Bag will be removed if you craft an active item, simply because the Bag is located in the active item slot (top left).

Bug!	After using Glowing Hour Glass 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, the Bag of Crafting will remain inactive, making it impossible for Tainted Cain to obtain any more items.

Bug!	Swinging the 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 player's bag.