Abstract: A container includes a cover engaged on an open top. A channel and an opening are formed in the cover. A knob is slidably engaged in the channel and includes a tube having a pair of shoulders. A plug has a pair of hooks engaged into the tube and engaged with the shoulders so as to secure the plug to the tube. A spring is biased between the knob and the plug for biasing the knob partially outward of the cover and for forcing the plug against the cover to enclose the orifice. The plug can be made of plastic material instead of metal material.

Abstract: A container includes a top-open container body having a tapered top-flange around the top opening thereof, and a top cover having a tapered bottom flange fitted around the top flange of the container body, wherein the top cover has a stepped air hole and a push-button plug assembly mounted within the stepped air hole and pressed to control the passage; the top cover has a recessed retaining portion moved to engage with a raised retaining portion on the container body for letting air pass through air guide grooves on the top cover and container body into the inside space of the container body.