The Topeak DynaPack DX Saddle Bag is a premium seatpost-mounted bag that combines near TrunkBag-level capacity with the convenience of a quick-release design—no rack required. Designed for riders who need versatile storage without compromising aerodynamics, this 9.7-liter bag features an expandable top compartment ideal for helmets, shoes, or jackets. Its rigid EVA foam and 600 denier water-repellent polyester shell protect contents from dirt and rain while maintaining a sleek, structured look. The lightweight aluminum exo-frame offers stability and mounts securely to seatposts measuring 24.5–34.9 mm, while the integrated Quick Release system allows effortless attachment and removal in seconds. With internal organization pockets, a 3M reflective safety strip, and a rear light clip, the DynaPack DX ensures your essentials stay organized, protected, and visible—perfect for commuting, touring, or long weekend rides.