Kangaroos

Kangaroos would be a mob in the desert biome hopping along with their little joeys. If you kill an adult kangaroo it would have a chance to drop its pouch (like a 30% chance) which would give you five extra storage spaces if you take the pouch and add it to a chestplate in the crafting table. This pouch would break when around half of an iron chestplate would be gone. This pouch would not carry over onto a netherite chestplate when upgrading a diamond chestplate.