These sleek Contigo Travel Mugs are very highly rated, thanks to their sophisticated Autoseal lids. The self-sealing lid automatically closes when not in use to keep beverages locked down, only opening at the press of an integrated button. Double-walled vacuum insulation keeps 16oz. of liquid hot for up to four hours or cold for up to 12 hours, and a durable stainless steel exterior keeps contents safe. They’re normally $20.99 each, but with this deal from Groupon Goods, you’ll get a pair of them for $24.99. Ships free.