Salewa Alptrek 50+10L Women - The Alptrek 50 is a comfortable trekking backpack made of light, very abrasion-resistant nylon with a fully adjustable carrying system and a capacity of 50 liters for hikes and long distances. On longer tours, it also offers you the option of adding another ten liters using the height-adjustable compartment in the lid. The lid is detachable and can be used as a single carry bag.