Patent ID: 8915234

Claim:
A cap assembly, comprising: a body configured to be fastened to a container for closing an opening in the container; an aperture formed in a floor of the body; a tether having a fastener, wherein a portion of the fastener extends through the aperture in the body, wherein the cross section of the portion of the fastener is at least fifty percent the size of the cross section of the aperture, and wherein the fastener further comprises a first flange positioned on a first side of the aperture inside the body; and a plurality of protrusions extending upward from the floor of the body to space the first flange apart from the floor of the body to prevent the fastener from blocking the aperture, wherein the plurality of protrusions are spaced apart from one another by a plurality of gaps that allow venting of vapors from the container around the portion of the fastener extending through the aperture, and wherein contact between the first flange and the protrusions limits movement of the fastener relative to the body.