ATHMOS SHAPE 20 lets the adventure begin. This super-lightweight hiking bag is made from recycled materials and has a full-contact back system that provides superb carry comfort and advanced ventilation. Like all the bags in Jack Wolfskins very lightweight ATHMOS SHAPE collection, they have equipped it with our innovative AEROSHAPE back system. So carrying your kit is super comfortable, even on strenuous hikes. The back system has an S-shaped design that mirrors the anatomical curve of the spine. This design ensures a snug fit and full freedom of movement. There is also a soft EVA foam on the back with large air vents for enhanced climate comfort. And thanks to the innovative one-piece construction, the AEROSHAPE back system has the extra advantage of keeping production waste to an absolute minimum. In addition, the air mesh fabric is completely recycled, just like the main material and the lining. The ATHMOS SHAPE 20 has plenty of stowage space for your day hiking gear. The roomy main compartment has an extra pouch for your water bladder. The pack also has a separate external compartment with stash pockets on the inside and a practical zipped compartment on the front. Large water bottles can be easily stowed in the two elasticated mesh side pockets and secured with the compression straps. The waist belt is padded for even more comfort, and it has an elasticated mesh pocket with a zip – a handy place to stash an energy bar or trail snack.