MSR Packtowel - various sizes
The extra large was more than adequate for each of my family after swimming. The towels are soft (more so than I expected). They seem a bit like a chamois. Seem to hold lots of water and dry faster than a regular towel. We were backpacking and did have to pack some up damp, though, that didn't dry overnight. The only down-side and reason for taking off one star, was that the loop for hanging is pretty fragile. We pulled the entire snap off the fabric completely, with the first use of one of the towels. They are marked 'pull this side' so it seems this is a common problem. If you pull the wrong side the entire snap and loop comes off the fabric permanently. The snap and loop part seems cheaply done and not at all sturdy. Otherwise a good purchase.
For backpacking the large would probably be fine as a personal towel. We used two mediums for dishes. The small is the size of a washcloth but came in handy for us also.