When I use the campground showers, I found it frustrating in some not having a place to put my shampoo, soap, etc. I took knee hi's, cut a small hole in the toes and put the bottle cap thur it. You can also put a bar of soap in one (soap on a rope). Then tied them together at the top, found a "S" hook large enough to hang on a shower rod or faucet handles. No more setting things on the floor or searching with closed eyes. I also use a small "garden" tool bag with lots of pockets to carry up to the bathrooms. No hooks to hang items on? No problem...over the door hooks or "S" hooks come in handy for that too. DH even admitted the knee hi's work great in the shower.
I have been using 3M hooks for years at home and in the RV. I recommend them to everyone.