Scratch-resistant and durable: The outer shell of the bag consists of 3 layers: an outer layer of PU + polyester, a middle layer of 5 mm foam, and an inner layer of polyester fabric. Side opening: The bicycle saddle bag has openings on both sides. It is made of durable and hard-wearing 500D material that does not easily deform. Large capacity: 1L total. Improved mounting system: The latest mounting system is adjustable by 180 degrees and features a quick-release mechanism, allowing you to easily attach or remove the bag.