Of all the koozies we've owned, this one is our favorite. Not only does it fold into the perfect pocket-sized packet that's completely charming (yes, I called a koozie charming); but it's made of the same technical materials as Rumpl's sweet outdoor blankets. Keep your beverage cold and your hand warm (and your friends jealous, because they will be jealous).
This is the ultimate in compressible, technical, beverage insulation. You should probably get at least two, because a) you should never drink alone, and b) your friends will probably steal them. Comes with a teeny, tiny attached stuff sack that can double as a pillow for your pet hamster.