Not durable, riped on my first flight. It's large, but if you intend to use a a piece of luggage I WOULD NOT!!!
zipper stuck on material along zipper line. Not easy to open. Hassel to open and close. Defective
A week worth of clothes fit's nicely. You can carry the whole thing on with an additional small carry on,then detach the backpack if needed to fit in the cargo hold. This gives you a small extra piece of luggage that won't cost you $$ checking