Nylon pants I've also derived great utility from thin nylon warm up pants with pockets, especially when other clothing is unwearably dirty, in the wash, or conditions are unusually dirt-producing, as nylon cleans easily. Weight is 5.5 oz. Sarong See Lisa and John's Eighteen Fabulous Uses for a Sarong . Also the zip turtleneck pictured above. Long sleeves are good for sun protection, and can always be rolled up.
Some backpackers take one pair of boxers for night ware and emergencies, travel commando otherwise.
Saves weight, but requires extreme caution on upzip. For winter or altitude you will want heavy-weight top and bottom underwear, a fleece or down jacket, and a long shell. 2 Down jacket or vest Traditional layering piece. The down vest at right supercompacts to the size of two medium fists and makes a supergreat pillow. Gloves Fast-drying materials like pile and polypropylene are preferable as wet gloves are no fun.