Bag of Crafting

   

"Make your destiny"

Item ID
5.100.710

Recharge Time

Unlimited

Item Pool
None

Collection Grid

(page 6, column 18, row 5)

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 low damage.
  • The swipe will appear further from Cain the higher his range is.
  • The swipe can be used to open spiked chests without taking damage.
• 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. Allows opening Mimic chests safely.
• 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 26 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 the pools listed in the table below.

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
35+	4-4
31-34	3-4
27-30	2-4
23-26	1-4
19-22	1-3
15-18	1-2
9-14	0-2
8	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.

• Skatole
• A Dollar
• Tammy's Head
• Steven
• Cube of Meat
• The Small Rock
• Blood Bag
• A Pony
• A Lump of Coal
• IV Bag
• Crystal Ball
• White Pony
• Ball of Bandages
• Key Piece 1
• Key Piece 2
• Head of Krampus
• The Polaroid
• The Negative
• Head of the Keeper
• Broken Glass Cannon
• Wait What?
• Broken Shovel
• Broken Shovel
• Mom's Shovel
• Knife Piece 1
• Knife Piece 2
• Dogma
• Dad's Note
• Redemption
• C Section
• Bag of Crafting
• Flip
• Sumptorium
• Recall
• Hold

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

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 only currently known way for this item to be acquired by a character other than Tainted Cain is through the Death Certificate. No actual item pools contain it.