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In the Common language, it reads:
This note can be REDEEMed to increase an appropriate item's capacity by 100 pounds up to a maximum of:

Back and shoulder containers: 140 pounds
Slung on shoulder containers: 60 pounds
Torso, attached to belt, and front containers: 40 pounds

NOTE: If your item's capacity limit is lower than the service amount, the item is ineligible.

~James
Player of Ietius

160 pounds should be the shoulder/back container? It is pretty hard to find a 60 pound backpack.

~James
Player of Ietius