The Bicycle bike Rear Seat Storage Cycling Pannier Saddle Rack Bag Trunk is a large, waterproof cycling accessory designed for all mountain bikes. Made of durable polyester material, this black rack pack/bag features a zip closure and is positioned at the rear of the bike for easy access while riding., this practical and reliable bag is perfect for storing items during cycling adventures in various weather conditions. Ideal for cycling enthusiasts looking for a convenient and secure storage solution on their rides.