I measured my Garter Stitch bag before I put it in the washing machine.

The square measures a little bit less than 4 inches.   Sorry for the glare.

16 inches across.

And almost 13 inches from the top point to the bottom.

It’s in the washing machine right now in a mesh bag and two pairs of jeans.

Felting.

I will check it in 15 minutes.

I hope I’m happy with the results.