Thank you for viewing. This is a 36L size rear box. The lock is a key type. Made of aluminum alloy, it closes securely and can be used with peace of mind. It also comes with a backrest cushion, making it comfortable for touring. A mounting base is included, so you can install it immediately without tools. It is waterproof and suitable for use on rainy days. Brand new, unused. You can purchase it directly without commenting.