I use a single thread to hand sew the binding on the back. Marvel

It's incredible how strong many small stitches can be...I use single thread as another poster mentioned, just like with applique. My stitches are usually a 1/4 an inch apart, sometimes a little closer if I know it will be washed often. Believe me, that binding isn't going anywhere! LOL*

I use single thread but every few inches I knot it.

i also use small stitches but every 15 inches i put a small knot. if the binding opens it will not all unravel.

I usually use either a double, and after about 10 sts I make a not. This will help keep the binding IF and WHEN a thread may break while in use. I do this on anything that I have to hem or stitch.

I use a single strand of hand quilting thread.

I use double thread and a ladder stitch so the stitches are just about invisible and won't get caught on anything.

I use single thread of regular sewing thread. When I try to use double no matter what I'm sewing on - it has a tendency to tangle. I did this on my oldest granddaughter's baby quilt - it's still intact and she will be 20 the first of February. It's been used/washed a lot. I do take very small stitches. Never thought about knotting every few stitches - makes sense tho.

I alwaYS USE SINGLE THREAD AND IT HAS NEVER CAUSED A PROBLEM .

i use a single thread, but I would say its just a matter of choice