They have PV foam towels used for drying cars in Walmart in the automotive section...come in a clear plastic tube, cost 6 bucks. Its my most useful piece of gear. When completely dry and folded it feels and weighs about the same as a styromfoam block the size of a pack of cigarettes. It absorbs 20 times its weight in water and releases 96% of it when you wring it. Makes a great bath towel, cut up it makes great headbands and wristbands, it dries your tent off in the morning like nothing else does.
Here is the really cool trick: If you get soaked take your clothes and roll them up in it and wring, do it a few times. It is amazing how well it removes the water, enough to put everything back on, and your body heat will finish the drying process in minutes.
This is the best 6 dollars you'll ever spend on anything that goes in your pack. I was curious to see what exactly the water content was in my pearl uzumi shirt after I'd dried it like this so I ran some tests at home. I soaked the shirt in a bucket of water and wrung it out in the PV towel a number of times then weighed it on a digital postal scale. I then completely dried it dryer and re-weighed it. The difference in weight was only 6/10ths of an ounce.