Not sure if you are asking what thread to sew the bag with, or if you are going to quilt the bag. I would definitely use a shade of gray thread to sew the bag with. I usually use a shade of gray when piecing multiple colors.

I would use gray, too. It was suggested to me, I had a black and white quilt I was finishing so I switched to gray, it did blend better than either the black or white.

I actulay use a taupe on just about everything. However, I would vote for gray over either black or white.

If you want your stitches to stand out, why not try and black and white varigated thread?

Thank you to everyone's advice. I will try the gray thread. I didn't even think of that.

Laura