The PPSU Transition Bottle Set is a four-in-one product that parents of young babies can use right through toddlerhood. The first stage is the bottle, which then transitions to a sippy cup followed by a rim spout to use both with and without handles. The box provides clear instructions for reconfiguring the bottles through the stages. The nipple shape is very comfortable for baby and does not leak. It also offers two vents that serve as an anti-colic system to reduce gas intake, and parents reported that there were less visible bubbles in the bottle compared to traditional ones. One of the favorite features was that the bottle offers volume markings to indicate the remaining liquid without unlatching. Another highlight feature was the rim spout, which, when pushed in, closes the spout so no fluid leaks out. With a wide mouth, the bottle is easy to clean. For $25 and for the length of time that this drinking system can be used, parents felt it was a good value.