Green Sprouts. Ever get caught out there without a baby bottle? Had to go buy ANOTHER bottle because of it? Keep this nifty product in the diaper bag at all times. BPA free! Stop carrying around multiple baby bottles while traveling. Simply turn a regular water bottle into a baby or toddler-friendly bottle! Adapter fits most disposable water bottles. Polypropylene collar with silicone nipple and spout. Size: Stage 2-4 (3-24 mo).