answer:I hunt them out at TJMaxx, Ross, and Marshalls. I check different stores until I find what I want. This is the best time of year, by the way. They carry models that have just been discontinued at the best discount that I have found. For a good carry-on, go for the size that all airlines will accept. Some will take up to 24”, but then other’s won’t. If it is wheeled, make sure that the mechanicism is entirely inside. You might be forced to check it at the last minute due to overhead space, and if it is on the outside, can get damaged. If it isn’t wheeled, then go for backpack straps so that you can go hands-free when needed. There are some duffel bags that have that feature.