Thanks to the huge success of the double pack chillsner root 7 have now brought us the single pack too its a dream for anyone who enjoys a cold brew on summer days and is a great gift for himfor any occasion you can actually drink through the single chillsner meaning youll never have to drink warm beer again how it works inside the chillsner there is a thermal gel sealed inside the steel body which once frozen stays frosty for much longer than ice and it wont dilute your cool beer