The Outpost Seat Pack & Dry Bike Bag ensures that you have all the gear you need for any outing. With an expandable design, this bag gives you the perfect amount of space for the trip. In addition, daisy chain loop webbing allows the attachment of lights and other gear. With an adjustable mounting system, the Blackburn® Outpost Seat Pack & Dry Bike Bag fits just about any bike. FEATURES: Bike Bag Expandable design Daisy chain loop webbing for attaching lights and other gear Includes adjustable mounting system to accommodate almost any bike Includes welded stuff bag to keep gear dry Capacity: 11 Liters Dimensions: 22” x 8” x 6” Weight: .33 lbs. Not recommended for carbon seatposts