When choosing a travel mug, a insulated coffee tumbler, a gallon water jug, a outdoor water bottle, a sports water jug or a protein shaker, many individuals recommend avoiding those with snap-on lids. These lids are known to pop off at the most inopportune times, sometimes causing painful burns. Even if users manage to escape burns, they may not be as fortunate when it comes to spills and stains. Screw-on lids are considered a far safer alternative. http://www.flowin-bottles.com/insulated-coffee-mug/thermo-travel-coffee-mug/