I use mason jars to store almost all my foodstuffs.

Mason Jars are glass and heavy.

Breakability and weight are major considerations in a campervan.

Fancy-pants airtight plastic food storage is expensive.

How to store food safely, lightly and easily?

Deli Containers! With food-safe silica moisture absorbers!

UPDATE: Square is more efficient, so wound up swithing to these: