The Infinity Backpack is a tool that allows you to store big amounts of items in a portable way.
It can hold 3 specific fluids: biofuel to allow automatic operations to function, essence from the picked up experience (when auto-pickup is enabled) and liquid meat to feed you automatically.
When Magnet Mode is enabled nearby items will be teleported to the player when they can be picked up.
When Auto-Pickup Mode is enabled items that can go in the backpack picked up by the player it will go into the backpack automatically.
Each slot can be configured to void excess or to refill stacks that aren't full in your inventory.