Mag-Tank Bolt-On Stem Bag: The Mag-Tank takes a new twist on top tube bags. Instead of a zippered opening, access to the bag is by contoured top flap held in place by a magnetic buckle with mechanical engagement. It will not unintentionally open and spill your gear. Grommeted holes in the bottom of the bag allow it to be bolted securely to the top tube of frames with the provided mounts, and a stem strap provides additional stability. Magnetic buckle allows one-hand access while riding. Grommets on bag bottom allow bolt-on mounting to top tube, and padded bag bottom conceals bolt heads inside the bag, protecting contents. Stiffened side panels help the bag hold its shape. Interior lined with yellow fabric for greater visibility. Please note – while the cover to this bag is designed to shed rain and spray, due to the large panel opening it is not a sealed bag or water-proof. This product is made with ECOPAK 100% recycled polyester.