The DaKine Session 8L Pack has slightly more volume and is built for fast riders; fast up and fast down. If you don't want to be encumbered by your pack, but still need to carry some armor this is the pack for you. It has a trim shape; just a couple zippers and some straps to secure knee guards or a helmet. There's an externally accessible open pouch with expandable mesh sides. The larger open pouch can hold small elbow guards, and arm/knee warmers. Zip open the large main compartment and there's a dedicated pump sleeve and a padded MP3 player pocket with a headphone port. The smaller, zippered compartment has a zippered mesh pocket and an elastic mesh pocket to hold all your extras. There is also an external, zippered, fleece-lined sunglass pocket and a Flowlock reservoir to hold your fluid. The Flowlock Reservoir has a roll-top opening which makes adding liquid a simple, spill-free operation.