I have a Maurice Messenger and I just LOVE it. I have had it for about 3 years, and use it constantly, and it is still in fantastic condition. The maurice would be good for what you mention, might be a bit small, but it has good pockets for nappies, and I do use mine for short trips when I only take a spare nappy too...

I was going to get one as a nappy bag too, but ended up with and OiOi...

I would definitely recommend them!!!