Adds backpacks which can only be found as loot! Backpacks are balanced. This means that to wear a backpack, you must equip it on your back. You can practically only wear one backpack at a time (with every backpack comes a slowdown). Place backpacks on the ground, and use them as portable/equipable chests.
Backpacks have some customization options and can have up to three different upgrades.
(Balancing note: Backpacks are not meant to give you unlimited inventory space, and especially not during combat encounters. During combat encounters they are at best meant to be placed on the ground, and allow you to prepare before a fight. Their main utility is to carry more food, weapons, potions on arduous journeys and to carry more items when moving from a base or when constructing.)
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