The present invention relates to a method of manufacturing a can to receive and to be closed by an easily removable cover merely by the action of vacuum and without the help of any mechanical means. The cover is provided with a sealing gasket, a relief hole and a detachable seal. The upper end of the can is provided with an outwardly wound cord. The upper part of the can is retracted with a marked reduction in diameter as compared to the remaining portion of the can. The upper part of the can is retracted such that an external border of the cord is kept in the same vertical alignment with the remaining portion of the can. This upper part is retracted in this manner so that when the cover is placed on the can, the internal face of its flange is in touch with the external face of the remaining portion of the can. This produces a can which can be closed by an easily removable cover having an unclinched sealing gasket. The retention of the cover and air-tightness of the can are obtained by the action of vacuum which is formed inside the can by some physical or mechanical means.