Huh. Stainless steel bottles made in China? Wonder how much lead and chromium and other heavy metals are leaching out of them.
Chromium is the most significant component of stainless steel when if comes to being stainless. Stainless steel commonly used in cookwear has 8-10% chromium. Chromium atoms near the surface of the steel react with oxygen to form a tough, impervious chromium oxide layer that protects the rest of the steel. If that layer thins or gets damaged, more chromium migrates to the surface and oxidizes. In other words, the protective layer is self healing.
Chromium, as best I could find, is not a highly dangerous heavy metal. In quantities that an unprotected mill worker might be exposed to, it is considered dangerous. But that is much higher than anything we might experience from finished stainless steel products.
Regarding the other metal bottles. Sigg lines their aluminum bottles with a proprietary plastic reduce reaction with acid liquids. Sigg has sold aluminum bottles (without the lining) for fuel (es white gas) for years.
How are these SS bottles when it comes to weight and denting? How practical are the tops? These days I mostly use (and reuse) disposable water bottles (PETE) instead of Nalgene. They are much more convenient to use one handed. They are even better than the pop top bicycle bottles that I used to buy (which often were to stiff).