Baba+Boo supply Tops Day Nurseries with their lovely Marty Mouse branded wetbags, and they are made available for Tops parents to buy.

A wetbag is a reusable, waterproof and leak resistant bag that zips shut to help keep odours (and liquids) from escaping. Wet bags are typically designed to transport soiled nappies, but because of the waterproof fabric lining you can also use them to transport wet clothes, swim suits, and more. 

You can find a whole range of great fabric designs, and different sizes at the Baba+Boo website