The YETI MagDock Cap is the solution for people that lose the caps to their insulated bottles while on the go. The plastic construction is lightweight while providing a magnet for the cap to attach to so it doesn't roll away while you're in the rocky desert, lush forests, or through the concrete jungle. A leakproof design ensures that you won't spill while downing your beverage on a hot summer day, and the narrow spout lets you drink without fighting the ice cubes away.