i have been using this backpack for many months now and really like the big size because i can bring my Alienware m18 (18 inch laptop) with me during travelling. the other compartments are also very spacious so i can bring my clothes or other gears with me as well.
all the zips are working very well (except for 1 compartment where the zip is a little bit difficult to move) and i usually carry around 10 kg of items in it without any damage. so far so good :)