The 24 oz vacuum insulated Hydro Flask has a smaller mouth opening for better control, allowing for less spills and more hydration. The larger size works for an endless variety of activities, which means the 24 oz Hydro Flask bottle will go with you wherever your imagination takes you. Like all Hydro Flasks, the 24 oz is designed to keep cold liquids chilled for up to 24 hours and hot liquids hot for up to 12. The double wall 18/8 stainless steel also means no sweating, keeping your desk, car or backpack free of condensation and moisture. Hydro Flask is proud that all their products are BPA-free, 100% recyclable and are backed by a lifetime warranty. Look for the H-guy and Hydro Flask logo to ensure youâre getting the market's premium insulating beverage bottle.