Whether youÕre storing in the refrigerator or stowing for travel, the Dr. BrownÕsª Storage Travel Cap gets your baby bottle ready for anything! Take the Storage Travel Cap along with your bottle wherever it goes to keep the contents safe and secure. Simply remove the teat, collar, and internal vent system, screw on the Storage Travel Cap, and youÕre done! Seal the bottle when youÕre finished pumping, when transporting, and even when warming the bottle. ItÕs also the perfect companion when youÕre traveling by air, preventing the effects of a pressurized cabin on the Dr. BrownÕs vacuum-free bottle. BPA free.