Pura KiKi is the only 100% plastic free bottle in the world, stainless steel bottle and collar (304 grade) with medical grade silicone nipper or sprout and travel cover, guarantee your child is NEVER in contact with plastic, BPA, EA, or other petroleum derived toxins. Paint used on the outside of the bottles is non-toxic and free of lead, phthalates, PVC, and BPA. Exc. It transforms from an infant bottle into a sippy cup, straw cup, water bottle & snack cup. Same bottle, you can just switch from nipple to spout, or straw, or flat caps Volume markings for measuring are inside the bottle. Contoured for small hands Easy cleaning with wide opennings 11 oz sippy bottle (6 months +) comes with an XL sippy spout and a travel cover.