here's something I did this year as an experiment:
2 under the bed storage things, (tops thrown away). stack them, holes top and bottom, holes in the side lips to run pipe cleaners through to tie it shut.
Worked great! Lots of itty bitty blanket flowers!
But now that I've read how you others have used the ones with the solid tops I won't be passing them up again! They are lots cheaper!
I did use some of those that I had on hand with out the lids and just taped clear trash bags over the top with slits cut. That worked just fine too.