I purchased this SOC bag from Amazon, and while I do think it's purposeful, it could be better! It don't balance well when it's expanded and full, so it's awkward to use it in the rolling configuration. It is also somewhat hard to pack while it's expanded, as it gets a little "sloppy" and cumbersome. Does it carry a lot? Clearly. Does it get the job done? Sure. Could it be improved? Everything can!