One of the better inventions of convenience stores.
The Xtreme Gulp, a 7-Eleven product, is a big car mug used to store beverages from the Big Gulp machines. It's big, it's insulated, it only costs 89 cents to refill, and it's a bright red color that can be seen from miles around, just screaming out, "Look, I've got 52 ounces of pure caffeinated drink in here, who wants to mess with me?"