Tiers: leather 27 · copper 45 · iron 54 · gold 81 · diamond 108 · netherite 120 slots (1/1/2/3/5/7 upgrade slots).
Right-click opens it. Wear it: put it in the chest slot, then sneak + F to open. Upgrading in the crafting table keeps the contents.
Crafting Table3 × 3
1 × BackpackRequired materials
String4 ×Leather4 ×Chest1 ×
Crafting Table3 × 3
1 × Copper Backpack
Crafting Table3 × 3
1 × Gold Backpack
Crafting Table3 × 3
1 × Diamond Backpack
Crafting Tableshapeless
1 × Netherite BackpackNo backpack inside a backpack (not even inside a shulker box in it). Shulker boxes themselves are fine.
The contents belong to the backpack item: throw it, give it away, die — everything stays inside, nothing duplicates.
Place it: sneak-right-click a top face. Pick up: sneak-right-click with an empty hand. Hoppers can access a placed backpack.