Topeak's MTX Trunk DryBag is perfect for commuting and running errands on your bike in all weather conditions. This great bag is constructed of seam sealed 300/600 denier waterproof polyester and features a padded shoulder strap and carry handle so it's easy to take along everywhere. And, Topeak's ingenious MTX System makes it a snap to attach it to your Topeak MTX QuickTrack rack (sold separately). Added features include a reflective strip, a clip for a rear light and weatherproof zippers, too.