The Gregory Contour 50 backpack packs more technology and innovation into 3,173 cubic inches than most manufacturers' high end expedition packs. Weighing just under four pounds, the Contour is perfect for everything from overnighters to extended weekend hikes. Gregory's Response LT suspension system is strong, simple, and lightweight. At the heart of the system is the Wire Wishbone frame, which provides effective load transfer straight to your lumbar region, where it can be carried most efficiently. The Frame also incorporates a cross stay that prevents pack barreling and helps maintain the pack's shape. The back panel is composed of a breathable fabric equipped with a spacer mesh for a cool ride.One of the Contour 50's coolest features is the pack's Trail Smart packing system. The system divides the pack into three separate zones, which are strategically located for easy access throughout the day. The first zone is the largest and closest to the body. This area is for large, heavy items such as your tent, sleeping bag, and bulk food. Keeping the majority of the weight close to your body increases efficiency and reduces fatigue. The second zone is at the front of the pack, farthest from your body. This zone is for items that you typically need to access during your hike, such as lunch, first aid equipment, and rain gear. The third zone is on the side of the pack and puts items within your reach without removing the pack like your camera, a quick snack, water, or maps. The Contour also provides easy access to small items with dual waist belt pockets and a large dump pocket on the front of the pack. The top load provides water resistant storage for all your essentials through a roll top lid and water resistant zipper. And, speaking of waterproof, the Contour comes with an integrated, color matched rain cover to keep your gear safe and dry when an unexpected storm pops up.