Features: Unique Design: With the roll style closure inside stayed totally dry keep all your gear dry through days of wet riding and keep your back and butt clean as a fender during riding that is easy to clean by wet cloth later. Large Capacity: The seat bag has plenty of storage for all your clothing and gear. Large volume fit all of your cycling essentials at once such as a cycling pant light jacket ride food and bike repair tools. Suitable for: Great for a long distance ride you can keep cycling for hundreds of miles for hours or even days touring for bike-touring or staying on gravel or riding on bike paths. Sturdy: With solid construction the bike seat bag is easy to mount to the seat and stays securely in place. You can roll up small when you don't have much to carry unroll large enough to fit a change of clothes and bike tools. Safe: There are reflective strip on the rear so you can hang the tail light on the back of the bike saddle bag increases visibility and night safety also great for night bikepacking. Well designed shape reduces air resistance bring you better cycling experience. Specifications: Material: Polyester fiber+TPU Capacity: About 10 liters Waterproof: Waterproof design Size: About 49.5*5.2cm before expansion about 57.5*5.2*29cm after expansion Weight: About 0.45kg Feature: 1.100% waterproof TPU liner 2. Adjustable buckle triangle stability 3. The elastic cord increases the capacity 4. Bottom built-in keel design 5. Curling seal Notes: 1. Due to the effects of light and shooting angle the actual color of the item may slightly differ from the color shown on the picture. includes: 1 * Bicycle tail bag "