An expandable bottom compartment accommodates more mission-critical gear. DETAILS GET MORE CAPACITY! We carefully consider what is put in each of our bags and tailor the compartments, pockets and other features to make sure there is a perfect place for everything. Sometimes you need more space, while other times you need less. This bag expands to accommodate both. The coated 210 ripstop nylon and polyurethane zippers provide extra protection and water resistance. Includes an adjustable mounting system to fit most any bike. SPECS:- Capacity 2L/3.5L Expanded Dimensions 342.9 x 139.7mm/228.6mm Expanded Country of Origin Vietnam Mounting Options Hook and loop Product Weight 280 grams Water Resistance Water resistant - Extra protection against the elements