The Ascender is purpose-made for trail running and fast hiking. A simple main compartment and functional pockets, which can also be used when moving, serve those who want to keep up a fast pace. The structure of the back panel has a layer that prevents sweat from being absorbed into the main compartment. - The shoulder straps attach to the edge of the backpack with adjustable rubber bands: the backpack does not swing while running - Generous pockets for drinking bottles, energy gels, phone and poles - Two elastic side pockets - Security pocket inside - Compatible max. 3-liter hydration bags (sold separately) - Detachable chest strap - Short instructions are printed on the lining fabric in case of an emergency - Compulsory emergency whistle included in many trail running events - The main fabric is bluesign approved and made entirely of recycled material The product does not contain PFC compounds