What is the process of storing food in toothpaste’ish tubes?

You know what I’m talking about, these food tubes that are popular for tomato paste, or pesto.

You know what I’m talking about, these food tubes that are popular for tomato paste, or pesto.

Searching for ‘food in tube’ or ‘how to make your own tomato paste in tube’ yields mixed results, so I’m wondering if I’m even calling this preservation method correctly.

I personally think they are amazing when cooking with small quantities (as opposed to cans), and I would like to ‘tube’ my own pastes, pestos, creams, purees, mustards, and whatnot.

However I have a very hard time to find any DIY info on what to buy, what tools are needed, etc.

Any advice on where to look for information about this process on a DIY standpoint?