Despite using packing cubes and having a very detailed system for packing clothing, I continued to use  plastic grocery bags (ugh!) to pack my shoes for the simple fact I could throw them away when I was done. I'd searched and found several different types of travel shoe bags but either they were way too large, taking up too much room in the suitcase (esp the cube style), or they were a stiffer nylon fabric with no stretch-again taking up too much room, or they were not machine washable. (I just could not get past the idea of putting dirty shoes in/out of the same bag without being able to wash it! Hence, my con't use of plastic bags!) I finally stumbled upon these and they are perfect!  In addition to being washable, what I like about these compared to several others I found is that the fabric is thin and stretches to fit around the shoes, almost like a second skin, taking up no extra space. And unlike some of the others designed to hold a pair in one bag, you can put just one shoe per bag which makes for more efficient packing. (I'll stuff one shoe between the bars in my hardside luggage and the other along the outside.) Lastly, while you can likely fit a pair of just about any style women's shoes in one bag, in the case of men's shoes you will likely only fit one shoe per bag regardless. My husband wears a 10.5 D and can only fit one dress/or athletic shoe per bag. I wear a 7.5 and I can fit a typical pair of 2.5"-3" heels (not platform) or wedges in one, or several pairs of flip flops.  While not for everyone, I purchased these in the black, neon, and burg/navy/grey colors so I could somewhat match to my shoe colors for easy identification in the suitcase. As far as washing, I washed them in a delicates bag and air dried them w/ no problem.