The Ortlieb Rack Pack S is a multipurpose, waterproof 24-litre gear/bedroll bag for cyclists, travellers and divers. The Rack-Pack S can also be used in combination with the Ortlieb Back-roller and Front-roller panniers (note! not City models) . Just clip the Rack-Pack to the panniers and you've got 50-60 litres of waterproof cargo capacity! - The full-width, roll-down closure keeps water and dirt out of the bag and allows easy, fast access to your gear inside. - Heavy-duty and 100% waterproof material. - 5 YEAR WARRANTY.