1. This bicycle bag is a great choice for cycling enthusiasts. It is made of polyester fiber, a durable material that can accompany you on various cycling trips. 2. It has a capacity of 1.5 liters, which is a suitable size. It's neither too large to be cumbersome nor too small to hold the items needed for daily cycling. Whether it's keys, cards, or some snacks, they can all be safely stored inside. 3. It's worth noting that it comes with a lining. This not only helps keep your items organized but also provides some protection to prevent the items from scratching each other. 4. It measures 5.7 inches and is delicately designed to fit different types of bicycles, including mountain bikes and road bikes. It can be used as an upper tube bag, allowing you to easily access your items while cycling. It can also serve as a saddle bag or a lower tube bag, flexibly meeting different usage needs. 5. Additionally, it is a touch - screen phone bag. While cycling, you can directly operate your phone through the bag to ensure you don't miss any important information. 6. In terms of design, it combines practicality with aesthetics. Its simple style complements the bicycle well, adding a touch of fashion to your cycling. With this bicycle bag, your cycling trips will be more convenient and comfortable.