Personalized Structural Eggineer Drawstring Bag. Eggineers are engineering eggheads. Structural eggineer text and a structural engineering egghead wearing a hard hat and standing on a steel beam is a fun gift design for birthdays, holidays and graduation. A durable and versatile cinch bag built to handle daily use. . With its lightweight design and reinforced corners, this pack is perfect for the gym, travel, or everyday activities.