【Quick Installation and Removal】Features a knob-style buckle design for swift installation and detachment, ensuring stability during rides. 【All-Weather Protection】Utilizes high-frequency seamless welding technology for superior waterproofing, safeguarding your belongings in various weather conditions. 【Versatile Storage】Includes internal mesh pockets for organized storage of personal items, freeing your hands for an unencumbered riding experience. 【Adjustable Bottle Holder】The adjustable knob system securely holds water bottles of different sizes, expanding its utility for various cycling needs. 【Durable Construction】Made from wear-resistant polyester with a PP board for structural support, maintaining shape and protecting contents from compression. 【Secure Fit】The knob-lock buckle wraps tightly around the saddle, preventing the bag from shaking or falling off even on rough terrains. Specifications: Material: Polyester Fixing Strap Capacity: ≈0.6L Bag Capacity: ≈0.2L Bag Dimensions: 8cm (W) x 13cm (H) x 5cm (D) Fixing Strap Dimensions: 5.3cm x 22cm x 4cm Waterproof: Yes (Not suitable for prolonged rain exposure or submersion) Closure System: Knob-style buckle