The Bifold Clamshell is the traditional clamshell with two components (front and back or right and left). Generally, one of the sides will be the cavity while the other side is flat to hold the product in place. The most common clamshell design is a front/back design with the front having the cavity and the back being flat.
Tri-fold Clamshells provide the customer with the ability to have the package stand by itself or hang. Due to the added material required for the Trifold, these are more expensive compared to the Bifold, but customers enjoy the versatility this design provides.
Quadfold Clamshells packing provide the highest level of protection due to the multiple layers of material. If the product is going to have a difficult transit to its destination, then the additional levels of security are worth exploring.