Designed To Keep your Drinks Fresh. Can be used for home, school, office or outdoor activities. Perfect as juice container for office, buttermilk bottle for office, milk shake container for kids or for storing flavored water. Easy to carry for backpacking, hiking, traveling, etc due to it's light weight. As these tumblers are airtight, they do not allow the liquid contents to seep out and ruin other items in your bag. The wide mouth design allows you to clean them efficiently to maintain hygiene.