As with all bottles in the Pura offering, our 11oz sport mini bottle is 100% plastic-free and can be used with any of our silicone lids including our nipples, spouts, straws, and flat lids. This bottle includes the unique big mouth sport top and a colorful matching sleeve. The big mouth sport top is free-flowing when open and leak-proof when closed. Additional Information: ~ Only 100% plastic-free bottle on the market; only MadeSafe Certified bottles on the planet ~ This bottle easily converts into an infant bottle, sippy bottle or sport/water bottle by simply swapping the nipple out for another Pura silicone lid ~ Single wall construction is lightweight, dishwasher safe, and shatter-proof ~ Bottle and collar crafted from safe, anti-bacterial, #304 stainless steel and medical-grade silicone Pura Silicone Big Mouth® sport top crafted from 100% medical grade silicone ~ BPA/BPS-free and will not leach toxins like plastic sport tops, bottles, or lids ~ Internal volume markings