PopYum is a better everyday baby bottle that stores water and formula separately in the bottle until hunger calls. With a single hand, simply pop (press buttons to release formula into water), shake a few times, and yum. Prepare enough bottles for the entire day, around town, at daycare, and for travel. PopYum wide nipple and natural latch support a smooth transition from breast to bottle. The anti-colic vent returns air to the bottle, not the baby's tummy. The included funnel makes the loading formula a breeze. PopYum is also great at storing breast milk with absolutely no leaks. PopYum is BPA, BPS, latex, lead, nitrosamines, PET, phthalates, PVC, and TPE free.