I bought this bag for a flight on Frontier for which I'd have otherwise had to pay $120 for round trip full size carry-ons. This bag easily fit under the seat and no one questioned it as my personal item. I used it for a weekend wedding trip and managed to fit a suit, dress shoes, dress shirt, two short sleeve shirts, socks, underwear, toiletries, etc, and that basically filled it. I could probably do a 3-4 night trip with this bag if I packed light and didn't need heavy/dress clothes, but I'm aSee full review