Multi-use Water bottle can be made from high-density polyethylene (HDPE), low-density polyethylene (LDPE), copolyester, or polypropylene. All offer the advantage of being durable, lightweight, dishwasher-safe, and BPA-free. The main difference between each type is the flexibility of the material. Copolyester and polypropylene bottles offer the greatest rigidity. HDPE bottles retain some pliability, while LDPE bottles (most commonly associated with 'squeeze' type bottles) are highly flexible and collapsible