The Nalgene Wide Mouth w/ Loop-Top Lid Bottle is a highly functional and popular water bottle designed for various outdoor activities, particularly backpacking. It is made from HDPE (high-density polyethylene), a lightweight and durable material that ensures the bottle's longevity in rugged environments. One notable feature of this bottle is its wide mouth opening, measuring 63 mm in diameter. This wide opening allows for easy filling with ice, enabling you to keep your beverages cool for extended periods during outdoor adventures. Additionally, the wide mouth design also simplifies the cleaning process, making it convenient to thoroughly wash the bottle after each use. The bottle comes with a loop-top lid, which adds to its convenience and versatility. This lid is designed with a loop, allowing you to attach the bottle to your backpack or gear using a carabiner, ensuring easy access while on the move. In summary, the Nalgene Wide Mouth w/ Loop-Top Lid Bottle is a lightweight and durable water bottle specifically designed for backpacking. Its HDPE construction ensures long-lasting durability, while the wide mouth opening facilitates easy filling with ice and cleaning. The loop-top lid adds to its functionality, making it easy to attach to your backpack or gear.