Material: 100D Robic HT nylon, 210D Robic HT nylon Volume: 35L (2135cu in) Support/Suspension: Perimeter Suspension (Spring Steel rod outline, PE sheet core) Shoulder Straps: dual-density foam Waist Belt: ReFit When we're heading out for a few days or weeks on the trail, you'll find the Perimeter 35L Backpack securely holding all of our gear. One feature of this pack that we're big fans of is the fully adjustable fit for both the shoulder straps and hip belt, making the transportation of heavy gear a comfortable experience. Thanks to the external mesh pockets, stuffing our extra layers and accessing snacks is a breeze.