This backpack can be purchased from equipment vendors..
Kenshi: Cheat (Umbra Backpacks) Free Download
Cost 25000.
They are divided into 5 levels: basic, mule, heroic, legendary and finally divine.
All have the same 30×25 interior space, but each level can carry more stackable units with less space, and all have a 100% load reduction.
The basic backpack has 10 bonuses and a 100x stack multiplier.
The medium backpack is the same as the base backpack but has a 500x stack multiplier.
The Heroic Backpack has 50 bonuses and a 250X stack multiplier.
Legendary backpack has 100 bonuses and 500x stack multiplier.
And finally, the divine backpack has a 1000x bonus and a 1000x stack multiplier.
These “bonuses” are the main attributes of backpacks: combat skill, stealth, combat speed, athletics and evasion..
Installation. Copy the folder from the archive to the mods folder in the root folder of the game.