This looks pretty amazing, thanks for sharing. I've just been playing with this on a couple containers. The first went from 197MB to 71.5MB - not bad! I did some testing and it didn't work without including a few extra pieces but pretty painless.
The second container went from 176MB to 4.7MB!! I've not really tested that so there's a pretty good chance things aren't going to work too well in practice (but we'll see).
If it all continues as well as it's started then we'll definitely be using it.
Do you mind sharing a bit of information about your container images? What's the app language for both? What kind of application is it? How do you init your apps in the containers? docker-slim is definitely not perfect and there's lots of room for improvement. Can you ping me offline (on github/gitter, twitter or email, my email is kcq.public@gmail.com)?
The second container went from 176MB to 4.7MB!! I've not really tested that so there's a pretty good chance things aren't going to work too well in practice (but we'll see).
If it all continues as well as it's started then we'll definitely be using it.