Mammut Aenergy 12 is an ultralight hiking backpack, the smallest of the Swiss brand's lightest and most dynamic hiking backpack line. Designed for all those quick hikes and daily adventures where you only need the essentials, in a light and comfortable compact backpack. Aenergy combines breathable and ergonomic shoulder straps with just enough back padding for maximum comfort without bulk. However, the hydration compatible main compartment is complemented by a large external mesh pocket and two chest pockets to keep everything close at hand. Mammut Aenergy 12 trekking backpack