Intended for multi-day trekking by tent. Its capacity is usually around 60 litres, up to 75 litres on longer treks. A trekking backpack has a lot of space and also has thicker hip straps and more adjustment options. Persons who like challenging treks will usually end up with a combination of daypack and trekking backpack. The trekking backpack is also best used for weekends and hut trips.