I recently went on a weekend trip and fit a pair of athletic shoes (could probably fit two pairs) plus three days worth of clothes, a toiletry bag, and other odds-and-ends in this and still had some space leftover. If you and a significant other want to jet away for a few days, you could just buy two of these and not have to worry about checking luggage. Also, just want to confirm that it comfortably fits in United's (mainline) overhead bins. Oh, and I almost forgot: the bag looks fantastic, it's well-made, and easy to maneuver.