Looking for a good quality travel bag. Must be a size that fits in the overhead bin (airplane), so something like 30l? I like the looks of the TAD maridian and axis bags.... but no way in hell am I paying that kinda cash. Since I will only be using this a few times a year, it doesn't need to be nuke-proof; but I would like to get something quality. I'm leaning more towards a duffel bag style bag, but am not looking to just grab a small gym bag. Any advice?