evo.com | Mammut Day Packs > The Mammut Ducan Spine 28-35L Backpack is an adjustable hiking pack perfect for a long day trip or quick overnight. Packed full of features like Mammuts Active Spine Technology(TM) support system and padded shoulder straps, you can be ready for any terrain in a pinch. An included rain cover, multi use pockets and hydration compatibility make this versatile pack perfect for whatever you have in store. 31 x 27 x 58 cm Water-Repellent Pocket with Various Attachment Options on the Backpack Mammut Active Spine Technology(TM) The flexible back system of the innovative - patent pending - Active Spine Technology(TM) transfers the weight of a backpack evenly to the body when walking. It gives the wearer greater freedom of movement for the hips and shoulders and avoids unpleasant friction. Consequence: greater wearing comfort, which is becoming particularly noticeable on steep ascents. Thanks to more freedom of hip movement, women in particular benefit from this technology. 91% Polyamide / 9% Polyester Adjustable Backpack Volume (28-35 Liters) | Mammut Ducan Spine 28-35L Backpack 2022 in Black | Polyester