Integration of outdoor functional aesthetics and cycling pragmatism. This lower tube bag offers simple and convenient installation, large-capacity storage, and thoughtful partition design for quick and easy access to your essentials. Compatible with multiple bike types, it features a streamlined, low-wind-resistance design that fits closely to the frame for comfortable, fast rides. 1.9L large capacity ample space to store daily essentials for commuting, touring, or long rides. Built-in pe support plate keeps the bag stiff and prevents items from being squashed. Velcro straps & buckle fixing easy to install without extra tools holds firmly in place. Streamlined narrow edges reduces leg contact while riding, enhancing comfort and speed. Side opening zipper & internal layered mesh bag scientific partition design allows one-hand access to items. Reinforced straps & anti-scratch bike guard ensures stability and protects your bike frame. Compatible with multiple bike types road bikes, mountain bikes, and gravel bikes. Multi-position installation can be mounted in different areas according to your riding habits. Pairable with same series bags buckle-link connection for extended storage during long-distance rides. Materials & durability bag body: wear-resistant and durable polyester, wrinkle-resistant for long-lasting use. Support plate: high-quality pe for structure and rigidity. Buckle: pom, ensuring secure attachment. Baffle rainshield: 70% tpu polyurethane 30% nylon, providin...