From the product description, check product page for current description, price and availability:

• This growler holds double the volume of standard glass growlers
• The double wall vacuum sealed design is proven to be the most effective insulation on the market
• Keeps Beer Cold For Over 24 Hours. A full pour only loses 4 degrees over 24 hours and 8 degrees over 48 hours while at room temperature.
• This stainless steel growler is designed to work with all standard 38mm growler caps and dispensers

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