Have you ever thought that chest carrying mobs are bad for carrying items. Inventory space is so limited so instead of always running out of room in your inventory you can make a backpack with this addon.
Backpack Crafting Recipe
Backpacks are similar to craft as bundles and can take awhile to hunt all those rabbits.
After being crafted you get this item that spawns in your backpack when placed on the ground.
This is the backpack entity. You can left click it to open an inventory.