The Topeak MTX Trunk Dry Bag is a fully waterproof rear bag engineered for durability and everyday adventure. Using sonically welded seams and weather-tight zippers, it keeps your essentials dry in heavy rain. The roll-top closure offers quick access while blocking moisture, and the semi-rigid EVA foam walls protect contents from road shock and vibration. Compatible with all MTX QuickTrack racks, this 12.1 L bag includes a padded shoulder strap and reflective graphics for added safety and convenience.