BabySafe USA Flow By HiSense Training Cup: Jason Perry, general manager BabySafe USA, here to tell you about the Flow by HiSense Training Cup. It is a BPA-free cup that includes a one-way anti-colic valve in the bottom of the cup, so when your child is feeding, it will allow the air to come in. No gas no bubbles. Shaped like mom and dad's coffee cup. They feel like they're a big boy or a big girl, just like mom and dad.