Abstract: This invention is a snap lock structure used with paper or plastic bag members to close an open end in a sealed, airtight manner. The snap lock structure includes an upper clamp member integral through a connector section with a lower clamp member. The upper and lower clamp members are similar, each having a main body and outer clamp sections. The upper clamp member has an outer lock head portion which engages in a locked condition a lock receiver portion of the lower clamp member. The connector section has a shield member to maintain the bag members in proper position for clamping.