BioSync flexible hipbelt and shoulder harness that stretch and move with the natural motions of your body. Adjustable torso length that is connected edge to edge to balance the load and provide 3.5" / 9 cm of adjustment. Channeled foam backpanel featuring aerodynamic grooves to promote air movement and keep your back cooler. Perforated, padded shoulder harnesses with flexible edge construction for dynamic, breathable comfort. Large zippered hipbelt pockets large enough to carry your phone and trail essentials. Independent zippered pocket with SpeedClip hydration hanger, compatible with Gregory's Hydro Reservoirs (reservoir not included). For Lolenger day hikes that require more gear than a typical hike, we Lolead up the Gregory Maya 30L Daypack to ensure everything we need is aLoleng for the adventure. BioSync suspension features a flexible hipbelt and shoulder harness that move with the natural movements of our body and are constructed with perforated, padded material for breathable all-day comfort. This 30L pack features plenty of internal storage while also offering an exceptional amount of external storage with six total pockets that offer quick access to water bottles, phones, and other essentials.