Be like Jack Reacher, every three days or so buy some cheap new clothes and throw the dirty ones in the garbage. Whether on multi-day motorcycle rides, overseas travel, ski trips, or other times where I carry my clothes I do what others here have said. Everything is either nylon, polyester, or merino wool. I wear one set and carry a spare or maybe two if finding water is questionable. I take ten minutes each evening to wash what I wore that day and everything is dry be morning. If things didn't quite dry or I didn't have enough water or time then I wear the spares and wash both the next evening and start all over again.