These are approx..
I took a string, wrapped it around the middle, then measured it. Bug nets on both.
WBBB loose - 7", tight 5"
WBXLC loose - 6 1/2", tight 4 1/2"
The gathered end knot was 5" on both.
By loose, I mean I'm not pulling the string as tight as it will go. I'm giving it some compression, but not much.