The PRO Gravel Seat Bag is a great choice for extra storage on your next bikepacking trip. This bag features a large single compartment with 15 liters of storage space, accommodating a wide range of items you may want to take on your trip. It also includes a bungee cord for some extra external storage. This bag is completely waterproof and is built with anti-swing technology to make sure it remains still and does not disrupt the ride. Reflective accents also help improve rider visibility and safety. The bag simply straps to the back of your seatpost, keeping a low profile and avoiding the wind. With the PRO Gravel Seat Bag, riders can take loads of extra items without disrupting their ride.