A backpack looks big - but it's an illusion. Once you start packing, it shrinks. The longer your trip, the smaller the backpack. Or so it seems. Clothes,
Backpacks Ready for Travelmedicines, safety gadgets, flat water bottles with special spouts, crampons in case there's ice, hiking boots in case there's mud, special socks for winter and special socks for summer, windbreakers,