6 Pack Sun Screen Flask Lid Seals 6 new pressure sensitive seals that hold tight to the rim till peeled off. Sunscreen Flask sold seperatly.^Insures leak proof flasks lids which is the #1 complaint about these types of flasks.^Works on all Go Pong Smuggle Your Booze and Smuggle Mug 8 oz Sun Screen Flasks.^Adds extra protection against "The Man" finding booze in your flask^No worries about it leaking in your bag or purse.