Stanley Classic Growler Set Vacuum insulated body and foam insulated lid keep beer cold 24 hours Heavy duty handle is easy to carry and pours smooth with one hand Steel inner lid. No plastic contact for your beer. Tumblers stack infinitely to save space when packing or storing 18/8 stainless steel won't rust; naturally BPA-free The 64 oz growler is vacuum insulated for 24 hours of crisp, refreshing beer. 4 stainless steel tumbler are infinitely packable and durable Iconic styling, bomb proof construction, cold trapping insulation and an easy pour lid