Amazing backpack!  Took it to London for a week's stay and managed to fit almost everything in here except the things that I put in my "personal" item.  No one glanced twice at it as far as if it was eligible as a carry-on, even though I'm fairly certain it was over the weight limit.  (When you compact that much stuff, it gets heavy.)  It has great compartments and, combined with packing cubes, did a stellar job of helping me carry everything and keep it organized too.  I really like it, will use it again, and would totally recommend it to others!  I got it in 3 colors (gray, green and purple - one for each of us traveling) and everyone loved theirs!