No, they aren't supposed to be anything. Docker added this concept of a "graphdriver" where things are stored as their delta on disk as they assume you'll use

No, they aren't supposed to be anything. Docker added this concept of a "graphdriver" where things are stored as their delta on disk as they assume you'll use many of them. Obviously your first windows container is gonna use up more blocks in that type of storage than a linux container built specifically to be small[0] [0]: http://gliderlabs.viewdocs.io/docker-alpine/ http://gliderlabs.viewdocs.io/docker-alpine/