Cork Bottomed Mugs You Make The Rocking World go Round! No need for a coaster, this mug has one built in to the bottom. So no getting yelled at by your wife (or fed to tigers) for leaving rings all over the table she just cleaned! Take that, Carol Baskin! With an easy press in lid, you'll minimize spills while transporting that sardine oil, or coffee...Honestly, we won't judge what you put in it. With it's lightweight feel, you can take this mug on your last minute trip to Costa Rica or on a bike ride around your Tiger Compound!