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Hydroflasks are used to keep water cold or hot. What’s the biggest size and smallest size?There are two types of hydro flasks – insulated and non-insulated. Insulated flasks come in three sizes; small 3oz, medium 6oz and large 12oz. Non-insulated flasks come in four sizes; small 4oz, medium 8oz, large 16oz and extra large 32oz.In…