Hi Grace I'm sorry to hear your not happy with the size of the nappy bag , many of our customers use them and fit a lot of items in , the size is deceiving on what you can actually fit in it. It isn't a big like overnight nappy bag its a pram nappy bag for day trips, I also sell bigger nappy bags that are more for overnight / long-term use.
Also the size is clearly listed on the website listing when you click to order as well as in the photo section. Its always good to look at the size of something before ordering it :)
Thank you , Courtney MINI fashionista