64 oz.? Wow! It sounds like it's time for a big adventure. Or maybe for a small adventure with a big group. This water bottle is perfect for sharing water on the river, on the trail, car camping, sailing, anywhere you may need to refill water bottles. Not only are Klean Kanteens free of BPA and other toxins, they are also made of stainless steel which is easily cleaned and does not retain or impart flavors. Whether you use this water bottle for yourself, or for a group, you'll be ready to go and well hydrated.