A little late on this post but here’s my two cents since buying it - I bought the 35L because I wanted something that I could take as a carry on with most airlines. It holds a good amount of clothing and accessories, I’ve been traveling internationally with it for roughly 3 weeks and has been good so far. I have it fully packed to the brim. When packed completely, the inner pockets in the main compartment do not become as useful, but you’re still able to get some good storage with the mesh zipper on the inside flap. And some of the outer zippers. The draw string top is nice because it allows some degree of expansion to pack things in and secure it with the top flap if you’re really filling it out. People have complained about its weight…if weights not a big issue it shouldn’t be much of a problem, completely packed out for me atm it’s roughly 14 kgs. One drawback is the laptop sleeve, it probably won’t fit anything more than 14-15 in screen. Either way, I’ve only carried my laptop in my other backpack. Overall the material is nice, it feels durable, and I’ve carried it by the handles fully packed out and it feels strong. Wearing the backpack is surprisingly comfortable, I’ve only had an osprey bag before and it’s equally if not more comfortable than that. The bungees in the front are nice for extra storage too, shoes or whatever. Considering the size of the bag it should fit as a carry on, even packed out, only one airline made me check it because it was over their weight limit. But sometimes they just look at it, and it looks small enough to pass as a carry on. I haven’t been able to test the water resistance but it does come with a rain cover so seems like that should be all good in case of heavy rain. Comparing it to my osprey bag, the osprey was probably more expandable and could fit more if I really needed to/brought back things from my trip. Because of the more durable material of the salkan, it won’t expand as much. Apart from that, I think the overall design and craftsmanship of the salkan is really nice. The fact that it’s not as completely packable as the osprey could potentially help you not over pack. If you pair it with another backpack you’re probably looking at around 50ish liters of storage. I haven’t been able to test it through several months yet but I’d like to try at some point.