I bought this bag for a solo train trip on which I would have to tote myself whatever bags I took. This bag bungeed perfectly to my rolling bag and functioned well as a single bag carry on.  It held more than enough for an overnight. There are zippered compartments on each end to hold snacks, bottled water or whatever else you would want easy access to as well as keeping it separate from your clothing. It looks nice, not like a typical duffel bag.