Personalize this Milo Copper Tumbler 20oz With Cylindrical Box in bulk and save moreDurable, double-wall stainless steel vacuum construction with copper insulation, which allows your beverage to stay cold for 24 hours and hot for at least 8 hours. The construction also prevents condensation on the outside of the tumbler. Easy sipping, push-on lid with slide closure. Wide opening for comfortable filling and pouring. Leed’s Exclusive. 20oz.