The Aventon Rack Top Bag is the ultimate accessory for your commute. This bag features a spacious main compartment that is conveniently divided for safe & easy organization. The Rack Top Bag also expands into two expandable pannier side panels, allowing you to carry even more essentials on your ride. It&';s built to withstand the demands of your active lifestyle, ensuring that your belongings stay safe and secure throughout your journey on the road. Security is now more accessible than ever with Quick Release Compatibility. The Rack Top Bag mounts easily and securely to the Quick Release Accessory Adapter, making on-and-off a breeze. Quick release adapter plate sold separately. Dimensions Outer Bag: L: 14in, W: 10in, H: 8.5in Inner Bag: L: 13in, W: 6in, H: 7.5in Side Panniers: L: 12in, W: 4in, H: 14in Base: L: 12in, W: 10in, H: 1/4in Compatibility Compatible with the Quick Release Accessory Adapter, which mounts on Abound LR, Aventure 3, Aventure M, Level 3, Level 4 ADV, Level 4 REC, Pace 4 Rear Rack, Ramblas Rear Rack, and the Aventon Pizza Rack.