I second the vote for a camp towel, as it also takes up less weight, and also I bring a silk sleeping sack to make sleeping in any motel bed anywhere feel a bit more luxorious. Even for self-supported touring, its worth its compact weight. In mexico we often stayed in lovely cabanas in national parks, which while equipped with beds, the linen was often not in good shape, or scratchy, so the sleep sack really came in handy.