S'well 17oz Water Bottle With Flip Straw Cap in Black. S'well 17oz Water Bottle With Flip Straw Cap in Black. Cap, bottle and straw made from 18/8, food-grade stainless steel featuring Therma-S'well® Technology with triple-layered, vacuum-insulated construction designed to keep beverages colder or hotter, longer than all the rest. Perfect for the multi-tasker who likes to sip and go, the Flip Straw Cap is easy to use. Simply flip open for upright drinking and flip closed for leak-proof carrying.. Imported. Hand wash only. Fits most cup holders.. Leak-proof when closed.. BPA/BPS-free and reusable.. Keeps drinks cold for 36 hours and hot for 18.. Detachable stainless steel straw. SWER-WH4. 5299459. At S'well, they're a design company for good, best known for creating the first, reusable fashion hydration accessory. Founded by Sarah Kauss in 2010 to help rid the world of single-use plastic bottles, they believe something as simple as buying a beautiful reusable bottle or bowl can make a big difference. Whether it's their original, iconic 17-ounce bottle or their latest innovations in food, barware and accessories, everything they make is designed to perform and offer more ways to help you use less.