This bundle pairs Boon's innovative Nursh silicone baby bottles with convenient silicone straw conversion tops to take your little one from bottle feeding to big kid sipping. The Nursh bottles feature a collapsible 100% silicone pouch design that squeezes out air as baby drinks to reduce gas, colic, and burping. The natural feel silicone nipples encourage proper latching and tongue positioning. These 8oz bottles also come with stage 2 medium flow nipples, perfect for babies transitioning to a faster milk flow. As an added bonus, the silicone design is safe for the dishwasher, freezer, and even boiling. The included silicone straw conversion tops transform the Nursh bottles into spill-proof toddler sippy cups, helping ease the transition from bottle to cup. The flip-top rotating lids keep stray sippy messes at bay. And the whole system is top-rack dishwasher safe for easy cleaning between uses. With this bundle, you've got a baby bottle and toddler sippy cup solution covered in one safe, innovative silicone package.