A clamshell box is a protective box with a hinged lid connected to its base. The lid and base sections of the box have 3 fixed sides. The lid is slightly larger than the base so that the side pieces fit together when the box is closed. The spine side has a hinge to join the lid and base of the box.
The flexible spine allows the box to lay flat when opened. The outside and inside of the box can be finished with almost any material - paper, suede, leather, vinyl (just to name a few) - so let your creativity run wild!