Nalgene HDPE 1l Wide Mouth is made from HDPE (high-density polyethylene) these bottles are very lightweight and durable making them great for backpacking. This material was Nalgene's original for water bottles when they started, before their Tritan BPA material bottles became popular. They still remain a good option for those who want a bottle that gives was a little when you squeeze them, plus they also cost less. Weighs 125 grams. Model: 2079-0032 Made in USA