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These were originally carried in Pilot's Flightsuits, you can now use one as your daily hydrator. Or throw one of these sturdy, lightweight flasks into an emergency kit of backpack. Capacity is one pint. Fits where wider Nalgene bottles won't. Easily into a cargo or jacket pocket. Holds 1 pint. Dimensions are 6.5in x 4in x 1.5in. Made in USA.