Bag of Crafting

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.
- The swipe can be aimed at any direction.
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 Isaac 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.
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.

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.

Item Tags:

The Bag of Crafting respects item tags, and which items are available during the current run. This includes the following:

As The Lost, Birthright prevents items with the nolostbr item tag from appearing when using the Bag of Crafting.
As Tainted Lost, items without the offensive item tag will not appear.
As Keeper, items with the nokeeper item tag will not appear.
In Greed Mode or Greedier Mode, items with the nogreed item tag will not appear.
In Daily Challenges, items with the nodaily item tag will not appear.
In Challenge, items with the nochallenge item tag will not appear.
If NO! is held, active items will be skipped.
If Sacred Orb is held, items with Quality 0 or 1 will be skipped. If a recipe that can only result in a quality 0-1 item is put in the bag, it will replace the item with Breakfast instead.

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

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

Synergies

Abyss/Void: Can be used in conjunction with Bag of Crafting to gain a large amount of locusts/stat boosts.
The Book of Belial + Birthright as Judas / Dark Judas: Collecting Red Hearts, Half Red Hearts or Double Hearts with this item has a chance to transform them into Black Hearts. When a heart is transformed in this way, a special sound plays, and a black smoke puff appears. Does not work with Scared Hearts.
Pay to Win/XX - Judgement?: Can be a powerful combination for when Isaac is not Tainted Cain as he can craft multiple item pedestals in the Treasure Room which can be rerolled repeatedly using the generated Shop Restock Machine.

Interactions

Butter!: Bag of Crafting is dropped before pickups can be collected or items crafted.
Car Battery: No effect.
The Ludovico Technique: Swiping the bag at the Ludovico tear will bat it in the direction of the knockback.
Sacred Orb: Sacred Orb prevents crafting quality 1 and 0 items, typically resulting in them being replaced by quality 2 items. If a recipe that can only result in a quality 0-1 item is put in the bag, it will replace the item with Breakfast instead.
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.^[1] These items need to be unlocked to be crafted.

Pickups

Items

Uncraftable Items

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

In-game Footage

Trivia

There are $((\binom{29}{8})) = (\binom{29 + 8 - 1}{8}) = 30, 260, 340$ , 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.
The average consumable value is ~4.31.
Bag of Crafting's item description hints to The D6's item description as well as Tainted Cain's description, implying that "Destiny" is the items that will appear in a given seed.
Bag of Crafting used to have the "nochallenge" and "nodaily" tag instead of the "offensive" tag. The resulting changes now allow it to be encountered on Challenges, Daily Challenges, and by Tainted Lost.

Bugs

Bug!	While being controlled by mouse, having both The Ludovico Technique + Pop! will mess up the direction control of Bag of Crafting.

Bug!	In the Cantripped! (challenge #43), using a Bag of Crafting will crash the game.

Bug!	If the Bag of Crafting is used but not swung (i.e., is being held overhead) while returning from the Mirrored world, Isaac will not go back to normal, and will still have the properties of The Lost (flying, Holy Mantle effect) when returning. This effect persists across floors, but Isaac will turn back after some time.