The simple but clever ecotop beverage cover allows you to enjoy hot and cold drinks in even the roughest weather without having to worry about spills. Composed of a polypropylene base with a system of silicone gaskets, the ecotop is available in a variety of fun colors, is dishwater safe and is easy to install and remove from most 3in-diameter cups or mugs. The lids are even microwave compatible, although the manufacturer recommends leaving the lid open a bit to avoid “pressure buildup.”
$7. Ecotop, ecotopusa.com