Abstract: The present invention provides a system for approximating the contents of a dispensing container, the system comprising: a dispensing container comprising a vessel, the vessel having: a formation and/or a discreet element in or on the vessel which causes the centre of gravity of liquid contents of the vessel to be positioned differently, when oriented in a lain-on side attitude, from its notional position, in the absence of the formation and/or discreet element, and an indicator configured to indicate a change of the liquid contents of the vessel; a gauge, separate to the dispensing container, configured to be co-operable with the indicator of the dispensing container, the gauge comprising an interface between the gauge and the dispensing container and a scale which, in co-operation with the indicator of the dispensing container, signifies to a user the approximate liquid contents of the vessel.

Abstract: A container (101) has a constant wall thickness vessel (102) with a valve (103) crimped on at a neck (104) in the vessel. The valve has a dispensing stem (105). The vessel is circularly cylindrical and formed with an groove (106) extending parallel with the length of the vessel, from a base (107) to the neck (104). When the container is lain on its sidewall (108), it will roll, changing its orientation, until the groove (106) is at the surface as shown in FIG. 7, with the groove in effect floating on the surface of the liquid, providing an indication of the actual quantity of content in the container.