Instead of tracking the exact quantity of loose items that are difficult to count at a glance (such as ammunition, matches, caltrops, or similar items), use a d12, called the item’s Item Die. When you use the item, roll the die. If you roll a 1 or 2, the die decreases by one size.

If the Item Die is reduced to 1 and you use the item, it is expended and removed from your inventory.

d12 → d10 → d8 → d6 → d4 → 1 → 0

Item Stacks

Most loose items begin with (and have a maximum size of) a d12 Item Die, representing a full stack or bundle of that item.