10. The Milk Bottle Cap
Before cartons and plastic jugs, glass milk bottles came with simple paper or cardboard caps. These caps sealed the bottles and kept the milk fresh until someone popped them open. Some had colorful designs or the dairy name printed right on them. The milkman would leave full bottles at your door and take the empties back. People saved the caps or reused them in crafts and school projects. These tiny pieces of packaging are easy to overlook but once had a big role in daily life. Today, they’re a fun piece of nostalgia for collectors and history fans.