I'm impressed that everything fit on a folded up towel. I'm sure I could learn to do that, if the space required it. You can count on the space under your bike--the amount of space on either side depends on the number of bikes/rack. I suggest you bring a full-sized towel, and fold it up if you need to. Definitely bring a hand towel to dry off with. It's also good to have a water bottle only for squirting the grass or sand off your feet.