Features Material: [shell, lining] 100% nylon, [reinforcements] 100% polyester Volume: 2319 cu in Support/Suspension: Ergo Dynamic System Shoulder Straps: padded, adjustable, sternum strap Waist Belt: yes, padded, adjustable Description Product Description Jack Wolfskin's EDS Dynamic Pro Backpack carries the essential backpacking gear you need for an overnighter. Its Ergo Dynamic System is a well-ventilated suspension with a dynamic design for freedom of movement. Ergo Dynamic System also features a spring steel frame for relief and support. Abrasion- and tear-resistant Chaintech works with the lightweight Crossrip to make the EDS Dynamic Pro durable for the outdoors and comfortable for long hikes. What separates the EDS Dynamic Pro Backpack from most overnighters is the vertically divided main compartment. This feature includes a waterproof inner section for your hydration reservoir, a larger inner section with a secure roll-top access, and another quick-access section via the front zipper. There are more pockets in front, up top, and at the sides for personal organization. Lashing points secure trekking poles, and side compression straps ensure a secure load.