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.
There are , 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.
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.
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.
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.
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.