The main bag has a 70 litre capacity and then it has two 5 litre expanding pockets on the outside for additional storage. It has a fixed back system that it size tolerant which means it will fit the majority of people. It has top and bottom access with an optional split main compartment. On the outside there are numerous straps to attach items such as tents and roll mats and it has a zip pocket on the hood. The rucksack is made from a combination of 600D textured and 300D ripstop polyester fro strength and abrasion resistance. It has adjustable shoulder straps and a reinforced waist belt to assist in load carrying. Finally it has a bungee cord on the top, daisy chain on the front and is hydration compatible!