The Nalgene "Ultra Light" 32oz. bottles(almost 1 liter) only weighs 3.5oz. (99 grams) and is made of HDPE, which I belive has no known health risks. PETE bottles (soda, bottled water) are lighter yet and are likewise safe, although shouldn't be reused over and over.

Not insulated, though.

The new Nalgene clear bottles are made of Tritan™ copolyester, so no bisphenols.

Actual risk from the BPA bottles was very low, possibly none, when used in the normal way, that is, to contain water for drinking.
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Always remember that you are absolutely unique, just like everybody else. -Margaret Mead