Check the listing for details. EVOC WP Seat Pack 4L Waterproof Bicycle Seat Bag for Road, Gravel & MTB. Color: Blue, Condition: New with tags. Listed at 70.00 USD. Seat Pack WP New Waterproof Construction: Keeps your belongings protected from rain, mud, and dirt with durable, waterproof materials. Adjustable Capacity: Features a roll-top closure that allows you to easily adjust the bag’s size based on your storage needs. Dropper Post Compatible: Designed to work seamlessly with dropper posts, offering versatility for different bike setups. Soft TPE padding to protect your seatpost from scratches and damage. Flexible Main Compartment Closure: The adjustable closure adapts to the size of the bag, ensuring a secure fit and reducing excess bulk.. Item Specifications: Attachment Method, Velcro, Color, Steel, Defined Color, Blue, Volume, 4L, Water Protection, Yes,.