Large duffle next to the small duffle. I've used the small duffle as a carryon and it works well. It's also a good weekend bag, and if you don't care about the clothing inside being balled up, you could fit a lot of stuff into it. I think you could fit 2 basketballs into the small duffle, with room to spare. I'm going to use the large duffle this weekend on a road trip for the first time. It's a beast, and more than I need for this trip, but it's nice to have room inside and not have to dig through things to find what I need.