Waterproof function: This bike pannier is made of 900D Oxford cloth and has a roll-top closure design, which is super durable, tear-resistant, abrasion-resistant and heat-resistant, and the waterproof cover can make it waterproof when riding in rainy days Compatibility: Please confirm your bike rack size before purchase, support bike racks with a width less than 6 inches; The bike bag has a capacity of 16 liters per side bag, and the total capacity of 3 bags is up to 50 liters Strong Fixation: The bicycle rack bag has 4 strong straps and 2 strong Velcro. It also comes with 2 side hooks to perfectly fix it to the rack; there are also 2 straps to fix additional backpacks or items 3-in-1 Multi-function: The saddle bag bicycle bag contains 1 backpack that can be used independently, there are adjustable nylon shoulder straps inside the package, and easy locks on both sides, which can be easily installed and removed Comes with a rain cover: The bicycle accessories come with a rain cover, which can help protect your pannier and items from rain when you encounter severe rainy weather