I have the GR121L, and I’m in the process of swapping that one out for the 26L, for a little more space for traveling/gym clothes and shoes1. These two videos caught my attention. If you wonder why I love these bags, these videos will help.
The 21L is almost perfect for everything I need, but it’s such a tight fit when I put basketball shoes in it. And during my Nola trip, I packed for four days, and it was a little bit too tight for me. That’s when I knew that I needed the 26L, to give me a little more space.↩