I never take more than 3 underwear. I have lace travel undies that dry overnight and I just keep washing them. I also love Be Present pants that can be washed and dry in no time, but they went out of business. :-( My friend and I went to Copenhagen for 5 days with only 12 lbs of stuff, including my camera. There were still clothes I did not get to wear! My method is to pack what I think I need and remove one to three items before I close the bag.