From Project: Gorgon Wiki
- Inventory folders are a new way to organize your inventory. Folders don't increase your inventory size -- they just let you split up your inventory into different "bags". (We've avoided calling them "bags" or "packs" because we want to make it more obvious that folders don't increase your inventory.)
- Folders are intended for mid- to high-level players, because that's when we think they're most important. So you unlock them by hitting various skill milestones, listed below. Note: you can unlock up to 4 folders, but there are a lot more than 4 skill-unlocks. That's just to give you flexibility!