This is the type you'll use most of the time. It works perfectly for any project with straight edges - quilts, table mats, table runners, wall hangings, cushion covers. The vast majority of quilting projects use straight grain binding, and it's much simpler to cut and handle than its bias counterpart.

A good way to think about it: if your binding just needs to travel in a straight line around your project, straight grain binding is your friend.

Try this now if you have a scrap of fabric nearby: hold it by two opposite edges and pull. Not much stretch, is there? Now hold it diagonally - corner to corner - and pull. See how much more movement there is? That's the bias. And that stretch is exactly what makes bias binding so useful for curves and corners.

- You're making Celtic appliqué, where the binding travels along flowing curves and intricate shapes
- You're making a stained glass window fabric design
- You have a circular or oval project - a round table mat or a round pot holder, for example
- Your quilt has a wavy or scalloped edge rather than a straight one

If your binding needs to bend, curve, or navigate corners gracefully, bias binding is what you need. That stretch lets it ease around the curves without puckering or pulling. Straight grain binding would fight you on curves - and it would win.

Along the Celtic appliqué knot design itself: bias binding is used. Those flowing, curved lines need fabric that can bend and follow the shape without any pulling or puckering. Bias binding handles that beautifully - whether you are using it as a decorative applique knot as in this instance, or for binding a circular or curved edges project.

Same project, two types of binding, two very different jobs.

Straight edges → straight grain binding
Curves and corners → bias binding

That's it. Next time you start a new project, just ask yourself: does my binding need to travel in a straight line, or does it need to go around curves? The answer will tell you exactly which one to reach for.