1. The closure is one piece and liner less. It works with the bottle to create a guaranteed leakproof system.
2. There is a molded in ring seal inside the closure which fits tightly against the beveled inner edge (chamfer) of the bottle neck. This makes the Nalgene bottle a leakproof system.
3. The threads on their bottles have a continuous, straight-shouldered semi-buttress thread, not low quality round threads.
4. The shrink ring at the neck of most Nalgene bottles is molded so the inside surface is smooth, minimizing content entrapment.
5. They have heavy duty uniform walls which are generally thicker and very resistant to splitting or puncturing.
6. The bottom has curved inner corners for easy cleaning and a stable base with permanent molded-in resin code and volume.
7. Nalgene bottles and carboys contain no extenders or plasticizers such as phthalates (except for the PVC), which eliminates a source of sampling contamination.
Unlike a lot of plastic bottles, most of the Nalgene bottles (up to 4 liter) are injection blow-molded. This allows for more precise molding of the neck area and chamfer and more consistent wall thickness distribution. Injection blow-molded bottles feature a smoother, more stable bottom with less molded-in stress for greater product reliability. There are no pinch-offs to cause creases or splits which could harbor contaminants.
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