I am selling this because I no longer need it. Product Dimensions: 57cm length x 37cm width x 31.5cm height 【Strong Aluminum Construction & Excellent Craftsmanship】The GURBLOFY 65L top case features a unique patented design inspired by sports dumbbells, symbolizing strength and durability. Made of high-strength aluminum alloy and employing advanced spray painting technology, it is resistant to rust and corrosion, achieving a refined, stylish, and robust appearance. 【Large 65L Upgrade: Perfect for Adventure】The upgraded 65L bike top case has a large capacity design that can store two helmets and six drinks. You can also organize and store all your daily essentials such as smartphones, sunglasses, and gloves. The optimized design with external dimensions of approximately 57 x 37 x 31.5 cm (internal dimensions: approximately 55 x 36 x 30.5 cm) maximizes space efficiency. Combined with the included soft backrest, it is suitable for various scenes and is an ideal choice as a bike tank bag, tail bag, or trunk. 【High Waterproof and Dustproof Performance】The silicone sealing design effectively prevents the ingress of rain, dust, and splashes. With IP68 waterproof rating, it reliably protects stored gear and keeps it dry. The reinforced aluminum structure withstands harsh rides, and the classic black color has a simple yet luxurious finish, matching any bike style. It is a practical and stylish bike box suitable for adventure. 【Security Design to Enhance Peace of Mind on Your Journey】The 65L top case is designed to enhance security and peace of mind during travel. It features a built-in security lock, two reflective stripes, eight protective corners, and two shock-absorbing bands for the bike trunk lid to safely protect your belongings. It provides a safer and more secure journey. 【Easy Installation & Universal Bracket】Our top case with a padded backrest is incredibly easy to install with a universal base bracket that fits most bike tail racks. The installation steps are only four: 1. Release the bottom lock; 2. Take out the base bracket; 3. Attach the base bracket to the tail rack with the included screws; 4. Insert the top case into the base bracket and lock it.