I travel frequently and more hotels have better workout facilities so for the past couple of years I've  tossed my running shoes in my suitcase or wrap them in a plastic supermarket bag before tossing in my suitcase  Well they smell in the bag, or stay damp and nasty if I leave them in plastic.  I saw the reviews on this, and given the reasonable price, decided to try them.  They arrived fast.  The bag is rugged and durable, and collapses very flat in my suitcase when not in use.  The zipper is heavy duty. But most of all, there is a ton of room.  I have wide feet, and the shoe bag handles my New Balances with ease.  I'm going to buy a second to toss my dress shoes in.  Highly recommend.