Reusable, lightweight (single-wall construction) 18oz stainless steel bottle comes with a sports drinking cap made from safe, non-leaching polypropylene (pp#5). Weighs 8 ounces.  Made in China.

We looked at roughly 6 brands of stainless steel drinking containers, as well as one brand of aluminum, and the differences are primarily: 1) differences in lid/spout shape-designs, 2) size of container (ranging from small child-size to large adult-size like the Think-Sport Bottles), 3) single or dual-wall construction (dual-wall allows for cold or warm liquid storage), 4) price (varies from single-wall $16 to dual-wall containers up to $39, with price differences also due to size-variation and brand-name and design).

Some other stainless steel drinking container brands:
SIGG Trend Line: dual-wall various sizes, $28-$39, made in China
REI Vacuum Bottle: dual-wall (500ml), $32, made in China
REI Bullet Bottle: dual-wall (500ml), $19, made in China

Note: In comparison to plastic-bottles which leach various chemicals such as BPA, we discovered that all substances/containers will release some atoms or ions when subjected to high-heat and acid.  For example, even stainless steel will leach very tiny amounts of chromium and nickel when subjected to boiling and acids for long periods of time.  Under normal conditions, however, no detectable leaching was found in the literature we reviewed.  One researcher noted: "It is very unlikely that the total amount of chromium leached from stainless steel vessels, even into acidic foods, exceeds 50 µg/day (an amount considered beneficial to health)."  Stainless steel is considered to be safe even for use as cookware (pots/pans), which is often subjected to high-heat and some acidic foods during cooking.

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