Small and lightweight, the 12 oz. bottle is great when space is limited. It's the perfect size for juice and other naturally sweet drinks and rumor has it that grown-up Klean Kanteen fans commonly use it as a flask. Whatever you fill it with, the 12 oz. Klean Kanteen's compact size allows you to take it just about anywhere. It's the best choice for those times when the trip is short and refills are readily available. Weight: 4 oz.