I bought this bag on the recommendation of onebagtraveller website.  My wife and I had one each during a recent two month stay in Thailand and two weeks in Madeira. Packs flat for long haul flights or can be used as a handbag or laptop bag while in flight.  Only minor criticism is that it could do with a key clip inside the bag for room keys and the like and the water bottle mesh pockets are a bit shallow.  We solved the latter by using the loop on the tensioner to secure the neck of the bottle.
Great bag highly recommended