These are brown US Military Nalgene Bottles. These are NOT the lexan material, but a lighter weight brown plastic. These are unused but have some dust and such from long term storage. They have the Nalgene name and logo on the cap and bottom of the bottle. Great for all kinds of uses, we sell a lot to gunsmiths for Parkerizing and bluing chemicals, campers, hikers, boaters etc for water. The uses are only limited by your imagination, and they are cheap enough to get plenty.