The original vacuum insulated growler, the 64oz Hydro Flask Growler is the ideal size for filling up with your beer of choice from the local brewery and then taking that IPA or Porter to trails. Or head up to the mountain with the growler and have some coffee, hot cocoa, or hot soup waiting for you and the crew at the end of the day. With our double wall vacuum insulation technology, the Hydro Flask Growler is perfect for keeping your cold liquids chilled and carbonated for up to 24 hours, or your hot liquids steaming hot for 12. The wide mouth growler features Hydro Flask's largest opening and is .375 inches wider than our standard mouth bottles. Look for the Hydro Flask logo and it's unique and attractive shape to be sure you're getting the market's original, high quality, high performing growler.