Plastic Bottle Caps
Plastic Bottle Caps

This photo, taken after a 21-day marine debris removal effort by the Pacific Island Fisheries Service Coral Reef Ecosystem Division, shows 4,781 bottle caps collected from Midway Atoll's shoreline. Most plastic bottle caps are made from polypropylene, also known as plastic #5-- a hard, durable plastic that can be difficult to recycle in some municipalities.