Miniature Greenhouses (Dow’s Lake)

Update: ok, perhaps too late for seedlings this season, but consider using them to distribute your harvest.
*Consider this description as appearing on the back pages of a comic book. These are lightweight, portable, admit light, and have drainage holes. The roofs can open as seedlings get taller.
There are about eleven of the medium size, one larger and one smaller. +++The pile has grown!
You may have other ideas how to use them. Go right ahead, if you are the lucky claimant. No box tops required!