Your growler (especially a full one) is precious. We understand that, and so do the kind people at Growler On Board (growleronboard.com). That’s why they’ve created the BTU, Beer Transportation Unit. Think of it as a car seat—for your growler. Made from low density foam, the BTU is light enough to carry, even with three full growlers, while sturdy enough to keep it upright and insulated in your car. You can now rest easy that your beloved craft brew will be chilled and ready for you when you get home.