Clamshell packaging (also called clam packaging or clam packs) is a type of blister packaging.
Unlike a normal blister pack, clamshell packaging doesn’t have a cardboard back. Instead, it has a plastic back which is hinged to the front of the packaging, either at the side or the base.
Some versions are made so they can stand upright on shop shelves, while others are given a hole to be hung from racks. They might have a button to snap them closed, or be heat-sealed shut.
The bubble can be evenly sized on the back and front or can be a different size and shape depending on the product inside it.