2 Pack 5oz Joovy Boob PPSU Bottles $7.98 (Reg $22) + Free Shipping. See Target here for price comparison. Unique nipple design prevents nipple collapse, promotes proper latching and allows for easy breast-to-bottle and bottle-to-breast transitions. PPSU (Polyphenylsulphone) is the ultra-premium material for bottles. It stands up to repeated sterilization, will not absorb odor or color, and is BPS, BPA, phthalate and lead free. PPSU gives you the best features of glass and plastic combined.