Bottles are made of stainless-steel which means:

Durable
Eco-friendly
BPA-Free
Toxin-free (No harmful BPA's)
Non-leaching (no funny or metalic flavors)
Easy to clean

Why should I care about BPA?
Bisphenol A (BPA) is a polymer additive used in manufacturing many of the popular plastic water-bottles. The problem is that this chemical (which slowly leaches into your water) mimics estrogen and can induce hormonal responses linked to breast cancer.
 

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