ItemWithInventoryPrototypeItemStackIndex | "dynamic"falsetrueThe inventory size of the item.
1falsetrueCount of items of the same name that can be stored in one inventory slot. Must be 1 when the "not-stackable" flag is set.
stack_size = 1
booleantruetrueIf the item will draw its label when held in the cursor in place of the item count.