Description If you have ever wondered if clamshells exist in a vacuum, you are either aware of the products made by Charpak or have way too much time on your hands. Charpak uses vacuum forming to manufacture plastic clamshell packaging. The company also makes box inserts, food trays, and point-of-sale displays. The company's customers are in such industries as consumer electronics, food, medical products, music, sports products, and toys. In 2005 the company launched a new division focusing on medical device packaging.