A container including a base and a cap is provided. The base can include a pull down ramp and first threads on an exterior of the base and the cap can include one or more engagement lugs and second threads on an interior of the cap. The one or more engagement lugs are configured to engage with the pull down ramp to couple the cap to the base and form a hollow section between the cap and the base below the one or more engagement lugs and the pull down ramp and the one or more engagement lugs are configured to disengage from the pull down ramp to decouple the cap from the base when the cap is compressed into the hollow section. The second threads are configured to engage with the first threads to tighten a top of the cap against an upper lip of the base.

A cover operates with a bistable snap-fit mechanism for positioning on a closable opening of a container or on another element to be closed by the cover. The cover and/or a container wall region has fitted thereon a tamper-evident sealing element to be removed when opening the container for the first time, which, prior to being removed, blocks deformation of the front wall necessary for changeover between the two bistable states and/or prevents an expansion portion necessary for the snap-fit mechanism, from bringing about alteration to the outer circumference of the cover necessary for deformation of the front wall of the cover between the two bistable states. As an alternative, or in addition, it is also possible for a handle member, necessary for pulling off the cover, to be configured such that it can only be used once the tamper-evident sealing has been successfully removed.

The dish is formed by pressing a palm leaf to form a generally concave dish with a floor surrounded by sides extending to an upper edge. A rim extends laterally from this upper edge, formed as a unit with the floor and sides of the dish. A lid is provided which has a top surface with side walls extending down to a perimeter latch. This perimeter latch engages the dish, such as by snapping onto the rim. In one embodiment the perimeter latch extends downwardly from other portions of the lid and has at least one indentation which extends inwardly thereon to provide an upper recess above the indentation which is sized to receive a tip of the rim. A height of the upper recess is oversized relative to a thickness of the tip of the rim to accommodate some variation in dish thickness and some degree of dish warping.

A plate-shaped structure designed for covering a reservoir, the plate-shaped structure having a generally flat surface and a flange at the periphery of the generally flat upper surface. The flange has a plurality of openings designed to receive a protrusion on an exterior sidewall of the reservoir, thereby covering the reservoir.