I've just finished my new nappy bag. I'm really pleased with how it turned out. It's the first structured bag I've made. The pattern is found here http://amingledyarn.wordpress.com/gallery/tutorial-hip-mama-diaper-bag/ . It's just brilliant: lots of pockets to store things so they are easily accessible,big volume, yet not so huge it looks like you're carrying a spare tyre.
I altered the pattern slightly: used 3 inch strips of velcro on the flap instead of magnetic closures [so if I overstuff it I'll still be able to secure the flap]; & added a loop that winds around my drink bottle & attaches with velcro to keep my drink bottle standing up to one side. I also removed the regular zip pull & put a cute heart zip pull on there. A minor detail but every time I open that zip compartment the heart will make me smile.
Now I'm off to transfer everything from my old bag into it.