A classic duffle that you can use as your main pack or as a lightweight reserve bag in case you need extra storage. The Packable Duffle packs down into its own little pouch when not in use and can sit at the bottom of your pack until needed.
The classic expedition load hauler. These duffles have been used in arctic, desert and jungle expeditions all over the world. Simple, incredibly tough and built to the highest specification, these will just keep on going.