I purchased this to fit into my Louis Vuitton Large Neverfull bag and it fits perfectly. I thought it would be a tighter fit at first, but it's slightly smaller (width-wise) than expected. I'm sure once it's full with bottles, diapers, a wallet and snacks it will fill out much more. The insert also comes with a changing pad, which is a nice size and rolls up tightly in the bottom of the insert. Overall, I am impressed and excited to use once Baby arrives! Even without a baby, I think this would be perfect for someone who travels a lot. I would use on longer flights in my personal item to keep track of things. Highly recommend!