Caltex Plastics Caltex is a manufacturer of quality custom plastic bags, pouches & film. Click to visit our site & shop our polyethylene MIL-SPEC, ESD and food Packaging. Caltex Plastics is a manufacturer of industrial and commercial packaging. We produce laminated multi-layer barrier products into custom pouches, tubing, sheets, and sheeting for the electronic, military, food, pharmaceutical, and packaging industries.