Thanks for the feedback girls!

I've already considered all the things you've mentioned and practicality is far more important than looks but these bags seem to offer both so I'm happy to spend the $$.

I think I'll just have to pick out one of each brand and try them on the pram (have done so with a couple of bags already but thanks for the good tip again Rommy!). I want a black bag that looks more like a handbag and my pram is black and stone coloured so black will match the pram and hopefully my wardrobe. It seems like a practical colour choice anyway.

I've found some of the bags come with just one bottle warmer/cooler - is that enough?

I noticed that the Isoki bags come with removable compartments which seems like a good idea as you can pop them in the pram if you need to put extra stuff in the bag. They are reversible too so kind of two bags in one I guess!

The Oi Oi's are very stylish though. I love the Messenger bags.

OK, after all my rambling I've realised it will be best to grab one of each bag and try them out with the pram. They all have similar features so I don't think I can go too far wrong. Thanks for your help again!