Well after trying loads of formula milk dispensers, I've finally found *the one*! With my daughter I tried the Avent one, but it was rubbish! All the powder used to 'seep' into the other parts. then tried numerous ones that come apart, they was too big. So gave up and used the cartons.
Then I had my son (November 10) and tried the Tesco one - rubbish, used to seep to the other parts like the Avent. Looked on here and found this, so glad I did. It keeps the powder in the right part - no seeping, its great!! Its easy to use and wash. If fits nicely in the changing bag - not too bulky.