He is going to keep this flask forever
8795 People love this Hitting that 21st milestone will be a better experience with this flask gift set.
This set includes a round flask made out of stainless steel with a special "Happy 21 Birthday" message engraved on the front, two shot glasses, and a convenient funnel.
All of this is delivered in an elegantly packaged gift box.
He can cheekily bring his favorite drink to the stadium, movie etc and nobody will notice it.
There are also two shot glasses that he can use with a friend.