What a project this was!
I finished my new diaper bag late last night. It's the Modern diaper bag from Amy Butler's Little Stitches book. It's HUGE - I actually scaled it down 25% (except I kept the depth of 4", so there was lots of fiddling with the measurements before I even began) and now it's a perfect size for me. I think there were 50+ pieces to cut out, it was not simple or quick!
It has a magnetic tab closure, a cell pocket on the outside end, 4 interior pockets (I think I pleated these wrong, oh well) which are large enough for my diapee & wipee case, water bottle, etc.
I also made the matching changing pads (also from the book). I used this super soft minkee-type fabric and they are quilted. I made two so one can be in the wash and I'll still have one ready to go.