The Discovery Double Wall Vacuum Bottle will keep your water cold for hours, even if it’s left out in the sun. Here you get a silver bottle and a gold bottle, so you and your partner can each enjoy the benefits of a stainless steel bottle with insulating vacuum construction.2 x double-wall water bottles: 0.5L • 26.5 ( h )stainless steel outer & liner • BPA freenot dishwasher and microwave safepresentation box: 30.8 ( l ) x 21.5 ( w ) x 8.3 ( h )