What is the Sport Berkey Water Bottle made of?

The Sport Berkey Water Bottle is made of safe, non-leaching, BPA/BPS free low density polyethylene (LDPE recycle code #4). The cap is made of high density polyethylene (HDPE recycle code #2). The straw is made of polypropylene (recycle code #5). The number on the bottom of the bottle is not to be confused with the recycle code. The bottom of the bottle will be labeled with the die-cast (molding) number. This will vary from 1 to 4. LDPE is used for the bottle for its "squeeze" properties. LDPE is a very effective moisture barrier and is widely used for bread bags, trash/leaf bags, mustard and honey bottles, frozen food bags, tote bags, clothing, furniture, dry cleaning bags, and carpet.