There's no mightier backpack to stand up to the elements of your next adventure than Porter's Paramount Packer series. This collection is constructed from cutting edge GORE Fabric technology--the most advanced solution for waterproofing and durability. The resilience of these bags will blow your mind. Their outer layer is made from highly resistant CODURA nylon to insure years of use. Plus, you can fit all you need in their 23-liter capacity interior. And, the large outer pocket and deep side pockets with adjustable straps give you extra breathing room for all the rest.