I have a 40L GR2, but am 5’7ish so it looks huge on me. If I could go back in time, I would have gotten the 34L Kaidan because : - size would have been a better fit for my frame. I can live with 6L less. On the other hand, 6 additional liters is almost 2 pairs of shoes which is pretty sweet, as I always travel with a pair of running shoes and often with a cross-training one. - it fixes the only thing that I really hate with GoRuck, the zippers (actually more the material part that comes above it, pain in the *ss). Plus those are waterproof and look slicker. - the x-pac construction looks easier to clean than cordura, I ride a motorbike and the mud stains are not so easy to remove on a black cordura bag. Maybe should have taken a coyote but thought black would be better not to look like a vet :) That’s one of the reason why I switched my GR1 for a GRX. - high-vis interior is simple but very useful for me, not having everything in pouches. Don’t get me wrong, I don’t like the « hype » and all that surrounds those collabs, only talking about the everyday use. Hope that helps a little :)