An inflator (10) comprising a housing (12) having an interior and a plurality of gas exit orifices (14) formed therealong. A gas source material (20) is positioned in the housing interior and is enclosed in a pliable, rupturable substantially gas-and-moisture-impermeable container (24). The gas source (20) is a material (for example, hydrogen peroxide) adapted to undergo decomposition to form at least one gaseous decomposition product comprising an inflation gas. A reactant material (22) is also positioned in the interior of the housing (12). The reactant (22) is a material (such as a catalyst) adapted to react with the gas source material to produce decomposition of the gas source material (20). An enclosure (28) is positioned within the housing (12) to form a cavity (30) between an outer wall of the housing (12) and the enclosure (28). The reactant material (22) is positioned in the cavity (30). A plurality of orifices (34) formed along the enclosure (28) enables fluid communication between the interior of the enclosure (28) and the cavity (30). The container (24) is positioned in the enclosure (28). A resilient, expandable bladder (42) is also positioned in the enclosure (28). A propellant (44) is provided within the bladder (42) for generation of combustion gases upon ignition of the propellant (44), to produce expansion of the bladder (42). Upon ignition of the propellant (44), combustion gases expand the bladder (42), forcing a portion of the container (24) into the enclosure orifices (34), thereby stressing and rupturing the portions of the container (24) in the orifices (34) and releasing the hydrogen peroxide (20) to flow through the orifices (34) into the cavity (30), where it reacts with the catalyst (22) to produce inflation gas.