Luggage You Can Shrink and Stick Under Beds or on Shelves

We've stayed in hotel rooms so small that you had to slide over your luggage when getting got out of bed. Have you ever gone on a small-ship cruise and had to walk around your luggage for seven days? We have, but no more.  Here are several travel bags, wheeled duffles and backpacks that can be folded or collapse so you can stick them under a bed or on a shelf.