Okay, I think we should have a backpack, and it will give another row of items you can carry. But, there is a catch. While using it your sprinting will be slowed, and your hunger bar will empty a little faster. Worth it for an extra 9 slots in your inventory, right? I think it would be good for mining quarries where you have too much cobblestone, and building castles, where you have to have some slots open for more construction blocks, etc. The way you'll where it is where you put your armor, there will be an extra slot that the backpack and be placed into. Here's some of my ideas for the crafting. It'll be made of leather.