The classically designed the bike one 18l rucksack is great value featuring its own rain cover valuables pocket helmet holder a wet pocket for all that wet gear that you want to keep separate from your other gear and side pockets a hydration system is included in this compact bag to give you hydration on the go for comfort it has the airstripes system for ventilation a flat steel frame to ensure stabilization of your back a sternum strap and hip belt with mesh wings for security and