Salewa Alptrek 55+10L - The Alptrek 55+10L backpack is a comfortable trekking backpack made of light, very abrasion-resistant nylon with a fully adjustable carrying system and a capacity of 55 liters for hikes and long distances such as the Dolomites -Mountain trail. If you need to stow more gear, there is the option to increase the capacity by an additional ten liters with the height-adjustable compartment in the lid. The lid is removable and can be used as a single carry bag.