The term “plastic” used here is a generic term for synthetic materials. The use of these materials is primarily for stiffeners in containers. They replace the metal stiffeners used in military systems. High-density polyethylene (HDPE) was the first material used followed by Lexan®. Time has proven that moly disulfide (MDS) filled nylon is superior to the other materials and has become the most commonly used stiffener material. Today, the use of Lexan® is primarily in clear windows in pin protector flaps. Stiffeners should have rounded edges to prevent wear points and to minimize the ability of lines to half hitch around them. [Figures 3-80 through 3-84]

Fasteners are various types of devices designed to hold parts or components together or allow them to be held open or closed. The most common designs are hook and loop fasteners (Velcro®), snaps, grommets, and slide fasteners (zippers).