Athletic Works Unisex Fitness Gym Cinch Sack, Black

You gotta have a sack for sandals OP and you gotta wrap your sandals in some form of a linen when you put them away (collects all the dirty water). Use the small gym bags that have the string you pull to close the bag. Just put your shoes in them and tie it around your primary backpack. something like this OP. Ask a local church, co op, or the shelter