Ahhh, nothing promotes the merger of exercise and beer drinking like summertime. Hydro Flask, makers of traditional BPA-free insulated water bottles, also have a 64-ounce insulated beer growler in their collection.
Rather than inserting a liner for insulating chill and heat, Hydro Flask makes their bottles from premium 18/8 stainless steel with double-wall vacuum insulation. The result will keep beer cold for up to 24 hours. 24 hours. Whoa. That's an entire day. Good news for the lightweight hikers who get drunk and take the wrong fork after 2 German Weissbiers. You'll still have a good, say, 12 to 18 hours and 2 pints of brew to find your way back to the car.
Better sleep it off before driving home though.
Hydro Flask growlers have wide mouths for easy flow from barrel to hatch and are designed to add minimal additional weight to that of the liquids they encase. Even when filled with ice, the bottles' powder-coated finishes will not sweat or leave a puddle to mark their presence when set down. And when winter does return (Booooooo!) Hydro Flasks will keep soups, Hot Toddys, and Irish Whiskeys piping for up to 12 hours.