I have two nappy bags. One red one (no idea of the brand, haven't used it in ages, its in Steph's room and she has *just* gone to sleep) which is basically a change mat with pockets either side that when folded up looks like a satchel. That one is great for when Steph was a real bub. THe other bag, is from Big W I think (must confess, I got it from the Salvos for $2.75. I feel a bit mentioning that in the company of your +$100 bags... I think I saw it in their catalogue for around $40?). It has insulated bottle pockets at either end, an attached pocket inside that you can't loose, folded padded change mat (which I don't carry around, as I don't normally need it, instead it lives in the car), several pockets inside and out, and enough room to take several nappies, changes of clothes, bibs, clothes, wipes, and containers of food. And it has LONG handles that makes it easy to pick up and put over your shoulder when you have a bub in the other hand.

In the boot of the car, I have a green bag in a crate that has more nappies, clothes, wipes, and the change mat, as well as towels, and water (its AWFUL when they vomit in the car!)