I say no. First of all, your going to have to get your food awfully hot to render it organism free. Also the air in there is not organism free. Nor is the container itself. Perhaps if you sterilize the container as well and do it in a clean room. Or you could get a whole bunch of smoke detectors, break them open, pull out the americium and use that as a gamma radiation source and sterilize the whole thing with that. I have scalpel blades gamma radiation sterilized. Or you could get a short wave (germicidal) UV lamp, though you might need to mash the food for that. Then again you could probably just get one of the little vacuum sealers, it would probably be simpler.
chemkid
PS Please don't try the smoke detector one, its illegal and you'll end up on the evening news