Revelate Design MAG-TANK 1L Saddle Bag BlackRevelate Design took the beloved Mag Tank and made a version compatible with top tube bolt bosses. The Mag Tank takes a new twist on top tube bags. Instead of a zippered opening, access to the bag is by a smartly contoured top flap held in place by a magnetic buckle with mechanical engagement (read the magnet aids in closure, while load is placed on a connection). Unlike a conventional magnetic closure, the Mag Tank will not unintentionally open when