Salva 3 Good bag, and tough but not sure I am convinced this is the right bag for me. I am very active and always in search of the right backpack. I carry a 15inch MacBook Pro with lots of accessories, but I have a minimalist survivalist attitude and must be prepared. It is a lean style bag and I like that...it also expands which I also like but the expansion method leaves the zipper exposed. The zipper can rub or catch on your clothes but so far not damage to report. My most disappointing point is with the waterproofing. I walked for 30 min in medium rain and found that the top area was damp/ wet in some parts. Had I stayed out longer or the rain was more intense my Mac could have been impacted. Really difficult finding the right bag for my needs and thought by now waterproofing had improved.