Oh yeah Shawking, they have always warned about plastics...especially when plastic bottles face temperature changes. The obvious being from like a warm car or truck into the house or grocery store...however I remember reading something saying freezing/thawing the plastic causes more chemical leeching than the warm. Also, just because it says BPA free doesnt mean that it is entirely "bisphenol" free. It just means that it is 'bisphenol A' free. The is still bisphenol S...not to mention 7 or so other types of plastics.