Abstract: A portable emergency oxygen supply which may be carried without difficulty by a user and is safe under all conditions. The supply includes a canister containing oxygen-rich gas at relatively low pressure, the canister having a normally-closed valve which is provided with an actuating switch. The valve output is coupled by a feed tube to the interior of an inflatable bellows which is attached to and communicates with a face mask whereby the user is able to repeatedly inhale and exhale the volume of gas enclosed in the bellows, in the course of which he depletes the oxygen contained therein. The oxygen in the bellows is intermittently replenished by operating the switch so that the available oxygen in the canister is fully utilized.

Abstract: A collapsible terrarium assembly which is inflatable to assume a desired configuration for housing a potted plant or other article to be protectively enclosed. The structure is constituted by a disc-like base and a replaceable dome attachable thereto by means of a coupling ring which is adapted to snap onto a circular ridge formed on the base. The dome is formed by a flexible plastic envelope whose rim is provided with an annular skirt which is interposed between the coupling ring and the base to define a hermetically-sealed enclosure, the envelope including a valve for inflating the dome.