TIMELESS + DURABLE Built like a battleship, the legendary Stanley Classic Series is the choice of generations from the outdoors to the job sites. This series features 18/8 stainless steel double-wall vacuum insulation, naturally BPA-free, with a wide range of dishwasher safe, leakproof, and car-cup compatible products. . 18/8 stainless steel, BPA-free . Double-wall vacuum insulation . Leakproof + packable . Insulated lid doubles as cup . Dishwasher safe Hot: 20h Cold: 24h