Features Enter your model number to make sure this fits. Material: [main] 420D nylon Tritan ripstop, [base] 600D nylon Volume: 1830 cu in Support/Suspension: Motion Butterfly, aluminum frame Shoulder Straps: adjustable Waist Belt: yes, removable Description Product Description Whether its steep couloirs, mixed routes, or just the thrill of the summit that lures you into the alpine, the Mammut Women's Trea Guide 30 Plus 7 Backpack will get you there with all the gear you need to reach your objective safely. The Trea is made from a water-resistant nylon Tritan ripstop fabric, so you can depend on it to hold up against ripping ridgeline winds and mind-numbing alpine temps. To keep the pack comfortable, Mammut fitted the pack with its Motion Butterfly system, a sturdy aluminum frame, and high-density EVA back padding. The main compartment can be accessed through either the roll-top or the large side zipper. The padded hip belt can be removed for when you're planning on spending most of your time roped up, while gear loops along the back of the pack carry skis, ice axes, and trekking poles.