foldable duffel bag
I want a carry on sized duffel bag that can fold and be put in a carry on suitcase when not in use. I've looked into the REI big haul and the Patagonia black hole. I think the REI folds easier, but I'm not sure. Any advice?
Also, is 40L the best size to carry on? This bag will serve as overflow for random stuff, and will probably also use as a laundry bag at hotels.
Thanks!