Abstract: A tamper evident closure for a container has a seal member which is in a concave or convex condition to show closure integrity. The seal is visible through an opening in the cover of the container. Filling the container under pressure which is higher or lower than atmospheric produces the distention or contraction of the seal member that evidences that no tampering or leakage has occurred.

Abstract: The tamper indicating package includes a receptacle, such as a jar having a cover member threaded thereon. The mouth of the jar is sealed beneath the cover member with a seal member. The cover member has a depending flange with a slot that accommodates a tab indicating member joined to the seal member of formed integrally with the seal member. Rotation of the cover member from a predetermined closed limit position causes the slot in the cover member to interfere with the tab indicating member. The interference causes partial or complete severance of the tab indicating member from the seal member, providing a visible indication of previous tampering with the package.