For weekend backpacking trips and lighter multi-day treks where comfort and ventilation are paramount, you won't find a better pack than the Osprey Atmos AG 50. The AG AntiGravity™ 3D back system provides cushioning that smoothly wraps around your back and hips in 3D cushioned mesh, and you'll wonder where all that weight you packed went. The pack has an adjustable back length, making it adaptable to any body shape. The main compartment of the pack can be divided into two compartments if needed to keep the contents more organized. Access to the main compartment is possible from the top, bottom and side. The backpack can also be used without the lid thanks to the patented FlapJacket™ closure. Practical is the number of pockets that the backpack offers. Two pockets on the waist belt, two mesh pockets on each side of the pack, one mesh pocket on the front of the pack, two zippered pockets in the front of the pack, and additional storage is hidden in the lid of the pack. If necessary, a car mattress can be attached to the backpack thanks to the adjustable straps. Trekking poles can also be attached while walking with the Stow-on-the-Go™ feature. The pack includes a rain cover and an internal hydration pocket.