I bought the smallest size 'cause I don't need a lot of towel. I wasn't disappointed with the smallness! Make sure you get out a ruler so you understand how big these towels are.
I decided to clip the towel (with it's handy built in, durable clip) to my front pants belt loop. I sort of look like an ancient egyptian guy, but I just loved the access and the size was perfect for that attachment. I used it all trip long for everything from wiping sweat off my face to cleaning my dishes.....I know, not the most hygienic, but mighty handy and I was looking good compared to my companions.