Abstract: A container top comprising a container top member comprising tracks over an upper surface thereof and a sealer sealing an opening thereof; and a slidable member having a sealing mechanism, the slidable member being slidable through the tracks and positioned such that sliding of the slidable member over the tracks to one direction unseals the sealer, forming an opening over the container top member, in the initial opening thereof and wherein sliding the slidable member back to its original position over the opening formed thereby covers and seals the opening. The opening formed by the unsealing of the sealer can be re-sealed at will by the sealing mechanism of the slidable member. The sealing mechanism may be for example a sealing material coating strip located over a periphery of the slidable member or the physical configuration of the slidable member periphery edges.

Abstract: Safety cover mechanism for a container that comprises: a sealer; tracks positionable over the upper surface of the container; and a shutter member slidable over the tracks such as to allow covering and revealing the opening by sliding the shutter member over the tracks. The safety cover mechanism is configured such that sliding of the shutter member over the tracks away from the location of the opening of the container causes at least a portion of the sealer to unseal the opening thereby indicating that the container has been opened. A safety mechanism for containers with a pull or a stay-on tab and a press button sealer, where the tab pivotally connects to the container upper surface via a connecting element, wherein the safety mechanism is configured to prevent rotation of the tab over the axis of the connecting element for preventing unauthorized penetration to the container.