We're not speaking about laboratory equipment!

Retort pouches are being used more and more to process and preserve foods. They are not tin cans and teh difference is important for a food processor.

From the reference below:
The retort pouch is a flexible laminated food package that can withstand thermal processing. It has the advantage of offering the shelf stability of metal cans, coupled with the texture and nutrient value associated with frozen foods. The retort pouch has been considered the most significant advance in food packaging since the metal can, and has the potential to become a feasible alternative to the metal can and glass jar.