You can believe in this BIGFOOT! The perfect balance between size and function, this reusable thermos is ideal for all day outings, sporting events, on the job site or when you want time relaxing instead of refilling. The BIGFOOT Insulated Stainless Steel water bottle holds almost a quart and a half of your favorite drink to quench your big thirst. Featuring our TriMax® triple insulation technology, this bottle is vacuum insulated and tested to keep liquids cold for 36 hours and hot for up to 8 hours. Its dual use leak proof top has a wide opening for easy filling and a small opening for easy drinking. Now available with interchangeable tops!