Handy Haversack

This Backpack has a central pouch and two side pouches, each of which is an extra-dimensional space. The large central pouch can hold up to 80 pounds of material, not exceeding a volume of 8 cubic feet. Each side pouch can hold up to 20 pounds of material, not exceeding a volume of 2 cubic feet. The haversack always weighs 5 pounds regardless of its contents. Placing an object in the haversack follows the normal rules for interacting with objects. Using a bonus action, you can retrieve an item from the haversack, and the item is always magically on top.