Our most popular bottle, made with tritan material which is 100 percent free of BPA. This bottle established Nalgene as a household name and remains the company’s bestseller. Its design boasts more than 50 years of manufacturing fine-tuning that’s resulted in a remarkably durable, leak-proof bottle that’s guaranteed for life. Available in a variety of colors. Made of bpa-free Eastman tritan co-polyester dishwasher safe (top rack) superior impact resistance suitable for both warm & cold beverages convenient loop-top design marked with milliliters and ounces for easy measurement made in USA threads: Nalgene bottles and caps feature continuous, straight shouldered semi-buttress threads for increased contact area on the surface. This allows for greater tightening force without stripping threads cap: durable caps are designed and built to perfectly mate with their respective containers. There’s no separate liner to wear, crease, fall out, or leak, and the seal ring is molded directly into each cap fda compliant, bpa-free materials: Nalgene bottles are molded from 100% virgin resin. Finished products are tested according to the requirements of the usfda for food and beverage contact heavy-duty walls: uniformly durable walls are thicker and more resistant to failure than many similar looking bottles bottom: inner corners of each bottle’s bottom are curved for easy cleaning and a plastic resin code is molded into the bottle for eventual recycling after years of sturdy Service