There's a bit of sand/dirt. It might come off with a wash. Made with 600-denier fabric with a water resistance of 15,000mm, joined by heat bonding instead of stitching, it excels in dustproof and waterproof performance, and has passed the IP64 test. It's easy to match with any bicycle, and it's recommended to use it according to your purpose and the amount of luggage. Size: 36 x 13 x 5.5cm