Copper Vacuum Insulated Tumbler (minimum order 25 cups Minimum order 25 cups Geo 350 ml copper vacuum insulated tumbler. The Geo tumbler has a double-wall vacuum construction with copper insulation which means it keeps drinks hot for 8 hours and cold for 24 hours. The construction prevents condensation on the outside of the tumbler. Easy sipping, push-on lid with slide closure. Wide opening for comfortable filling and pouring. Volume capacity is 350 ml.