Duffel Bags are brilliant for storing and transporting gear that won't fit in your rucksack. The ones featured here are also water resistant enough to sit on a glacier for weeks on end, though the contents should be protected in dry bags if they are vulnerable to damp.
These Duffels have been selected for lightness - beware the Duffel that is so tough and heavy that it uses up half your luggage allowance on its own!