Original Bottle, 500 ml (17 oz), Opal Illusion. S’well Bottles feature Therma-S’well technology- a triple-layered, vacuum-insulated construction made of high quality, 18/8, food-grade stainlesssteel walls plus a copper wall layer for superior temperature retention. It means that beverageswill stay cold for up to 41 hours and hot for up to 18, while maintaining a condensation-freeexterior. The 500 ml (17oz) bottle emulates a standard size water bottle and is perfect for stayinghydrated at the gym or anywhere on-the-go. Bottle top is secure-fitting, leak-free and the openingfits most ice cubes. The bottle conveniently fits in standard-sized cup holders. BPA and BPS Free.Hand-wash only. By choosing re-usable S’well bottles you can help reduce the use of single-useplastic products that pose a threat to our environment.