Sac À Dos Fjörm 18LFjrm 18L is a completely waterproof backpack made for fast trekking. It has taped seams and a construction made for complete protection from the rain. Fjrm features an easy to use cinch opening with an additional lid for extra protection. The side mesh pockets can be used to hold a water bottle or extra gear. Simply attach your trekking poles with the bungy cord on the shoulder strap and use the toggle loop for use with hydration system.