I rarely review items on Amazon, but I needed to tell other people how incredible this bag is. My husband and I travel a lot, especially long haul, and this backpack is the real deal. Not only is it intelligently laid out, with super sturdy zippers, it’s waterproof and it can slide onto the handle of my carry on. I have a bad back, so this piece is invaluable.I’ve used it as a personal item before on Frontier and Spirit and, as long as I don’t overpack it, it’s perfectly sized. Two works - compression bags!Buy this / you won’t regret it :)