Trekking rucksack hiking backpack suitable for unisex colour blue style sporty features chest strap hip strap padded back back ventilation system hydration compatible outside pockets side pocket zip pocket additional fastenings walking pole holder ice axe holder straps padded shoulder strap ergonomic shoulder straps bag feature reinforced base material synthetic fiber materialspezifikationen 500 d jacquard weave supertex material properties water repelle