Givi T506 Waterproof Inner Bag for Trekker Outback 37 Dolomiti 36 Saddlebag Waterproof liner/exterior bag 35 liters Size 17.7" L x 8.25" W x 13" H Roll down closure system to ensure fully waterproof functionality Fits Givi Trekker Outback 37 Liter (OBK37) and Dolomiti 36L (DLM36) Saddlebag It can also be used on the lid of the topcase or saddle bag, fixing it with the included elastic straps