the first time I did a super extended trip back in 1984, I spent a lot of time in hostels. I was surrounded by kids sending clothing home and begging for more money. The lesson stuck. However,back then we didn't have Icebreaker and Smartwool products which, and I most certainly have done, I can wear for two week doing the Everest Base camp, sweat daily, and not stink. THAT is a worthwhile lightweight investment.