E-Flute boxes are 1/16” thick and the B-Flute boxes are thicker at 1/8″. For smaller boxes, the E-Flute may fold and perform better. Also, E-Flute boxes may look and feel more higher end. However, E-Flutes can be too flimsy for bigger box builds. In this case, B-Flutes are the better option if you are looking for bigger, sturdier boxes. If you’re not sure which flute you need, you can always contact us and talk to our design team.