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A little Docker example I keep coming back to:

https://github.com/radekstepan/im-runnable

It creates a little service that lets you run code (like Python, Node) in Docker sandboxed environment.

this is more of a Docker than a Deis question, but a Docker image is composed of layers. Each tagged image keeps an ancestry list of all of the layers it requires. In your case, if you run 5 docker containers on the same host on top of ubuntu:14.04, it will initially pull the parent's layers (ubuntu:14.04), then it will pull its own layers. They all share the same layers, which is why it's so powerful. You get the exact same execution environment every time.

They will share, and will spin up very fast, so size is not an issue.

They share much of the underlying OS.