phew KOMH...i had a couple of those with DD and ended up in for monitoring with contractions off the scale, but things calmed down themselves. the hospital put it down to strong braxton hicks coupled with a bit of dehydration
charitas.......I think there are too many variations on what people want from a nappy bag, and that the perfect one doesn't exist. If you can fill that gap in the market, your future is secured
For me it would look like a normal bag, preferably leather (have a leather handbag fetish ), with a couple of external pockets on the front and one each end. Inside, one of those inserts that you can take out that has all your personal bits in (that can be transferred to anouther bag) and enough space for a few nappies, pack of wipes, change of clothes, plus pockets for keeping creams, pins/nippas and wraps in. for real nappies I would generally take along a separate wet bag for wet/dirty nappies.
Another thought; the middle inserty bit that could take a couple of nappies and wraps and some wipes/creams etc that I could just transfer between exisitng bags would also be an idea.
Another idea would be something like this but a bit bigger to take a couple of real nappies and wraps. I have one of these and it's great for despicables, but not real nappies.
But, in the real world, after trying and not getting on with several changing bags, I just use one of those canvas re-useable shoppers that you can pick up for a few quid everywhere (current fave says "plastic ain't my bag" and came from saisnbury's) as they're big enough to just bung everything in, so not sure I'm the best person to give you suggestions.....but you did ask