Keep Clear 21 and Legal Flask from Laid Back. You'll be the life of the party when you give one of these flasks. This hilarious 6 oz. stainless steel hip flask has a decal on both sides. This stainless steel hip flask is a great 21st birthday gift and can hold your favorite drink. Includes funnel and attachment chain for easy filling. Measures 3 3/4 x 4 1/2.