As a full-time traveler, finding the perfect travel backpack is a task that requires a lot of research and considerations. I've spent an embarrassing amount of hours researching and trying different backpacks for my travels and I have to say, the COR Surf Travel Backpack is seriously underrated in travel circles.Not only is it extremely well-made and durable, but it's apparent that a lot of thought has gone into the design. It's waterproof, very comfortable to carry, has a pocket for everything, and quite spacious. I've lived out of this backpack for spring, summer, fall, and winter this year and it's done the trick for everything but winter. More minimalistic individuals might be able to get away with the 35L just fine, but as I prefer to be both a fashionable and functional traveler, I went with the 40L instead.This backpack has ample space for all clothing and shoe needs for spring-fall travel. The numerous pockets (including hidden ones) make staying organized very easy. This backpack has seen a lot this year and been banged up quite a bit, and, minus a few slight scuffs, you would never know. I holds up remarkably well! The padded straps (with pockets!) make it one of the more comfortable backpacks I've used. However, I want to note that if you're also carry a heavy DSLR with lenses, drone, and drone accessories like I do, you'll probably need more space than what this backpack provides;A few things that would have made a big difference would have been outside compression straps and a compression zipper on the outside to maximize space. The material is quite thick and well-padded, so you'll never feel like you have to worry about your laptop or other gear inside; however, due to the thickness you might find this bag more rigid and less compressible than other bags.Overall I've been extremely happy with my purchase! If you're not quite ready to upgrade to one of the more trendy (and expensive) full-time travel backpacks, I'd highly recommend you give Cor Surf's Travel Backpack a try! You won't find many better-built backpacks for this steal of a price!