Believe it or not they actually have small, thin quick dry towels, underwear, clothes etc. at places like Eastern Mountain Sports. The towel alone saves a lot of space over a cotton towel and is much more absorbent yet dries exceedingly fast. You can bring fewer clothes with you as you can just wash these items with a little scent free and have them dry within minutes it seems. I also have "high-tech" vests, jackets from North Face that are water resistant, warm, and take up less space than fleece. I think layers over bulk. I pick up any disposables, cheap razors, things I don't mind not taking back with me, etc. after I've arrived. Good luck on your hunt!