Triple Aught Design (TAD) Axiom x25 expandable backpack, super rare. 25L to 40L.
This bag was only available for a short time, and they never returned to the expandable design (as far as I know). Its ability to nearly double in capacity is very cool, and served me well in the time that I used it. As you can see from the photos, it's in used condition with some wear and tear, but all of the zippers are firm and fully functional, and it's in fine working order. Some of the zipper pulls have been replaced.
