The Welly Traveler Copper Vacuum Tumbler 12oz features durable, double-wall stainless steel vacuum construction with copper insulation, which keeps your beverage cold for up to 48 hours or hot for at least 12. The construction also prevents condensation on the outside of the bottle. Comes complete with on-trend, durable powder coating and the natural bamboo wrap. It features a screw-on lid and a wide opening for comfortable filling and pouring. Perfect for ice cubes and fits most standard car cup holders. Due to the nature of bamboo and powder coated materials, there might be a slight difference on laser engraved logos. No two pieces are alike which makes each piece unique for you!