But you have to seal the food tight in pressure containers and ensure there are no air bubbles. So it isn't so clear cut to me the energy saving is worth it. A

But you have to seal the food tight in pressure containers and ensure there are no air bubbles. So it isn't so clear cut to me the energy saving is worth it. Also the containers need to be eventually opened. Either this is extra step for processing, or, if that step is left to consumer, with all the complications of consumer friendly packaging requirements and recycling.