Here’s how to do so.
It’s a permanent upgrade that you’re free to craftafter completing the New Tricksmain quest.
These planets don’t have any sand.
The Elastic Durafiber Fabric costs 1400 credits - not exorbitant, but not exactly cheap either.
Star Wars Outlaws: How To Upgrade Your Carrying Capacity
Getting the Outlaw's Pouch, which upgrades your consumable capacity in Star Wars Outlaws, requires Durafiber Fabric.
