I'm not familiar with Nalgene, but I've read the plastic bottles used for beverages are made up of layers of different materials. The different layers serve different purposes. For example a soda bottle can contain a lot of pressure. They need to be strong and puncture resistant and not leach chemicals into the contents.
You might not consider it your concern, but why will it be labeled? Is the person planning to keep reusing it. There've been articles saying water bottles are made for single use. People like to refill them, but it's extremely difficult to clean out the bacteria that gets in when drinking from them. It's supposed to be a combination of the small opening and the plastic used.
Ken Devory Jr.
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