This bike top tube bag is made from waterproof material with welded seams and sealed zipper, keeping your items dry in rainy days. It is super slim and easy to install, great accessory for cycling. Features: Made from waterproof material with welded seams, durable to use. Sealed zipper closure keeps your valuables dry in rainy days. 2.6" super slim design reduces wind resistance and will not hinder your leg while pedaling, effectively increasing riding speed. Adjustable mounting straps for quick installation and release, suitable for various bicycles. Specifications: Material: Nylon Dimension: 21.5 * 8.5 * 6.5cm / 8.5 * 3.3 * 2.6in Weight: 110g / 3.9oz Package List: 1 * Bicycle Top Tube Bag