I picked up the Opossumbilities are Endless Insulated Stainless Steel Tumbler and it does exactly what it promises. The double-wall vacuum insulation keeps drinks cold for hours, and the powder coating feels durable without being slippery. I also like that it's sweat-proof and has a clear Polar Camel lid included. The laser engraving looks permanent, not like it will peel off. Hand wash only, so keep it out of the dishwasher. Knowing profits go to a fund helping Licensed Virginia Opossum Rehabilitators is a nice bonus.