A B737 CABIN ATTENDANT RPTS A MISSING SEAL ON A PAX LIFE VEST TO FLT CREW. FLT CREW INVESTIGATION REVEALS SEALS MISSING FROM MANY PAX LIFE VESTS.

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AFTER ARR AT GATE IN ZZZ; FLT ATTENDANT FOUND A SEAL MISSING ON A LIFE VEST. CALLED DISPATCH AND TALKED TO MAINT CTL TO MEL MISSING LIFE VEST SEAL. UPON FURTHER INSPECTION; FOUND A FEW OTHER SEALS MISSING ON LIFE VESTS. DECIDED TO DEPLANE PAX AND INSPECT ALL LIFE VEST SEALS WITH THE HELP OF CONTRACT MAINT. FOUND MANY MORE SEALS MISSING ON LIFE VESTS. CONTRACT MAINT COORDINATED WITH MAINT CTLR TO MEL MISSING LIFE VEST SEALS; CONTINUED FLT WITH MISSING SEALS MEL'ED. WHAT CAUSED EVENT: PAX RUBBING AGAINST SEALS WITH BAGS; ETC. HOW TO CORRECT SITUATION: PERHAPS STRONGER SEALS OR HAVE SEALS GUARDED FROM PAX RUBBING AGAINST THEM.CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE CABIN ATTENDANT RPTED AN UNDER SEAT LIFE VEST SEAL WAS MISSING ON A VEST. THE SEAL IS A VERY FLIMSY TYPE OF TIE WRAP THAT CAN BE EASILY BE BROKEN. A CONTRACT TECHNICIAN WAS CALLED AND THE PAX DEPLANED. THE CONTRACT TECHNICIAN DISCOVERED MANY SEALS BROKEN OR MISSING; BEING DAMAGED BY PAX BAGS OR OTHER ITEMS PUSHED UNDER THE SEATS. RPTR NOTED THE THAT THE NEW LIFE VEST CONTAINER DID NOT PROTECT AS WELL AS PREVIOUS CANVAS BAG TYPE.