Nalgene is a brand known for its durable and reusable water bottles, primarily made from BPA-free plastic. Founded in the 1940s, the company originally produced laboratory equipment before shifting focus to outdoor and recreational products. Nalgene bottles are popular among hikers, campers, and athletes for their lightweight design and resistance to impact. The bottles come in various sizes and colors, often featuring measurement markings for easy tracking of liquid intake. Many users appreciate the wide mouth opening, which allows for easy filling, cleaning, and adding ice. Nalgene products are also compatible with various accessories, such as water filters and carrying straps.