Dont think of Better-Bottle carboys as plastic - think of them as better than glass, because they are made from a special, scientifically tested, type of polyethylene terephthalate (PET), which does not have the disadvantages that make other plastics unacceptable for fermenting wine or beer.
Special PET -
Negligible oxygen permeability
No taste or odor
Meets FDA requirements with Kosher statement Clear and colorless • Exceptionally stain resistant
Smooth, non-porous, non-absorbing, hydrophobic surface does not carry over flavors (flavor scalping) and soaks clean without brushing
Superior resistance to cleaning and sanitizing agents.