Hydro Flask, Double Wall, Vacuum Insulated Stainless Growler Hydro Flask 64 Ounce Growler. Stainless, Double Wall Insulation (Beer stays cold for a long time). Keeps beer and water beer and water cold for up to 24 hours. Made from premium grade 18/8 stainless steel. BPA free. Lifetime warranty. Hydro Flask Insulated Stainless Steel Wide Mouth Drinking Bottle (64-Ounce, Stainless) More: Recent Amazon Finds