Abstract: A serving tray system usable by an intended user having a hand to carry objects, the hand having fingers and a thumb, the system comprising: a serving tray, the serving tray including a substantially rigid tray body defining a tray aperture extending therethrough; and a tray mounting element wearable by the intended user, the tray mounting element including a base and a tray mount extending from the base and insertable through the tray aperture to mount the serving tray to the tray mounting element. The serving tray is usable by the intended user to carry the objects thereon when the serving tray is separated from the tray mounting element and held by the hand. The serving tray is mountable to the tray mounting element by inserting the tray mount through the tray aperture to free the hand when the objects have been removed from the serving tray.

Abstract: A serving tray system usable by an intended user having a hand to carry objects, the hand having fingers and a thumb, the system comprising: a serving tray, the serving tray including a substantially rigid tray body defining a tray aperture extending therethrough; and a tray mounting element wearable by the intended user, the tray mounting element including a base and a tray mount extending from the base and insertable through the tray aperture to mount the serving tray to the tray mounting element. The serving tray is usable by the intended user to carry the objects thereon when the serving tray is separated from the tray mounting element and held by the hand. The serving tray is mountable to the tray mounting element by inserting the tray mount through the tray aperture to free the hand when the objects have been removed from the serving tray.

Abstract: A self-inflating object (10, 110, 210) includes an expandable body (12, 112) and an inflating mechanism (14, 114) at least partially disposed within the body. The inflating mechanism includes a canister (15, 116) of compressed propellant. The inflating mechanism is actuable to release propellant from the canister in a controlled manner to inhibit freezing of the inflating mechanism and/or the expandable body as the propellant expands thereby to inflate the expandable body.