Made from HDPE (high-density polyethylene) these bottles are very lightweight and durable making them great for backpacking. Wide mouth opening (63 mm) makes them easy to fill with ice or clean. For Your Everyday Adventures! Take your Nalgene bottle to the gym, office, camping, exploring and everywhere in between. This Nalgene water bottle is completely leak proof, made of virtually indestructible BPA-free Tritan, easy to clean and dishwasher safe on the top rack. 100 % waterproof, One handed closing technology for quick and easy drinking. Free of BPA, BPS and phthalates Whether you're looking for a virtually indestructible water bottle for a backcountry adventure, or you want a clean, green way of storing your dry pasta, you'll find a Nalgene product that gets the job done. Nalgene is a proud part of Thermo Fisher Scientific, for 70 years Nalgene has been making a wide range of BPA/BPS free reusable water bottles and containers to suit your personal preferences, needs and lifestyle here in the USA. With their easy-drinking narrow mouth (38mm) these ultralight HDPE bottles are still a favorite.