i have a M.E.C. one. ive used it for school, and light travel (its not enornmous) but its awesome, ive had it for....3 years now and it still looks like new.
ive also had a da kine one for like 7 years now...that thing just wont die. its so friggen durable. ive used it for school and travel as well. it looks more worn than the M.E.C. one, but thats to be expected i suppose.