I bought this Backpack in 2014 and I've been using it on a daily basis for school/university stuff but also always had it with me while traveling. This backpack has seen some stuff and I never had any concerns of packing to heavy or catching some rain on the bike. There were two big arguments how the shop owner got me to buy it: first one was lifetime warranty, the other one was using it as a beer cooler by just putting in beers and a lot of ice cubes. Both were true, my record was actually transporting 35 (0,5l) beer cans in it. All in all great Design, the side Pockets could be 1cm wider so the normal Kryptonite size would fit too also you shouldn't underestimate the weight of it (it's waterproof and nearly unbreakable so there's some weight), other than that it's a great long-time investment in a high quality product.