Carry everything you need on your next bike trip with the Revelate Designs Viscacha Bicycle Seat Bag. Featuring a roll-down enclosure, this large seat bag can compress or expand in volume as needed. Additionally, it features EVA front and bottom plastic sheets, offering structure and rigidity for load carrying. It also comes with an adjustable saddle rail strap, so you can position it just how you like it. Likewise, the urethane coated webbing offers fore-aft adjustment along saddle rails. In addition, the seat bag provides an internal compression strap so you can pack your items tightly. Similarly, you can use the strap for internal separation. The bag also loops on top so you can easily attach a spocket or bungee. Made in the USA, the Viscacha Bicycle Seat Bag offers a volume of 6 to 14 liters.