I have seen BPA-free Nalgene under,A 40x- stereo-microscope & A Piece of an Older Nalgene bottle.The result's convinced me that,The older one's are actually Safer,Why?The pores are consistently even & Much smaller, than the BPA-free type,of which were jagged & un-even,thus able to more freely Harbor Parasytes & other little nasties.This was shown to me by friends of whom have similar backgrounds to Blast's.They also state the BPA scare is a Big Farce!I would trust the word of a Chemist before All else,Afterall,Who else could possibly Know better?