【Scratch - Resistant & Durable】 This bicycle saddle bag is made of 100% polyester, which is not only abrasion - resistant but also water - . More importantly, there are PP plates on both sides of the bag to prevent internal items from being deformed. 【Enhanced Safety】 This bicycle bag is equipped with light strips that improve visibility at night (you need to order 2 additional AAA batteries separately). You can also hang a taillight on the back of the bag (the taillight is not included). 【Large Capacity】 With a 1.5L capacity and dimensions of 25.5127cm, it is very suitable for mini - pumps, wallets, folding locks, tire repair kits, or multi - function tools, etc. Additionally, there are several mesh pockets on the side and inside of the bag to store various items. 【Installation Method】 The quick - release clip not only provides eent stability but also enables the saddle bag to be removed and installed in a short time. 【Water Bottle Pocket】 Our bicycle seat bag is equipped with a very practical water bottle pocket. The elastic cord can better secure the water bottle (water bottle not included).