Backpacks /crystals

It gives 20 exstra slots when updated regular it gives 10 or 5 to upgrade it you can make it by a crafting table you need 5 lether 4 iron and i want back packs because i always carry a lotta stuff with me and others to so please add this with caves and you should add a crystal that you can make some kind of food or potoin or drink or lava/waterand if you add this thankyou mojang