Abstract: Essentially "U" shaped endless elastic loops, with the opening facing inwardly, removably hold first foil covers over access openings of flanged containers. The foil is placed over the container opening and flange formed around the opening. The elastic loop is stretched to encompass the foil cover and flange and then released to secure the foil cover over the access opening. Clamping strips can be provided with the elastic loops to hold second foil covers onto the elastic loops and over the container openings. The clamping strips are provided with protrusions or recesses that match recesses or protrusions on the upper surfaces of the elastic loop to clamp foils between them and over the access openings.