Watertight design with a large capacity keeps belongings dry during outdoor sports. This cycling backpack is designed for outdoor activity. Key benefits Keeps gear dry: watertight construction and ample main compartment protect your essentials during cycling, hiking, and trekking. Convenience and efficiency: designed for easy packing, access, and organization to support active adventures. Enhanced safety: reflective strips improve visibility during night rides, helping you stay safer in low light. Hydration on the go: built to work with a water bladder system, helping you stay refreshed and hydrated during outdoor activity. Durable and versatile: reliable performance for repeated outdoor use with compatibility for standard hydration systems. Use scenarios Long cycling tours or daily commutes: keep your gear dry and access water without stopping, even in wet conditions. Hiking or trekking excursions: generous capacity for extra clothing, snacks, and essentials while maintaining comfort and protection from the elements. Night rides and early morning sessions: reflective strips boost visibility, supporting safer rides in low light. Specifications and compatibility highlights Function: watertight protection, large capacity, hydration integration, and reflective safety features. Compatibility: supports water bladder systems for hands hydration; suitable for cycling, hiking, and trekking activities. Size and capacity: described as large capacity to accommodate essential gear for outdoor activities. Performance: designed to maintain dryness of contents, provide secure storage, and enhance rider safety with reflective details.