Nappy bag

Like my search for the perfect pram, I'm still looking for a great nappy bag. J bought me a good one that really suits a small baby (when you need to carry heaps of stuff) but now that LB is older, I find I need something smaller and less nappy-bag-like, if you know what I mean. I'm thinking of making one. This is what I had in mind (the orange one). I'm also really keen on these print envelopes you can get covered in plastic (looks better than it sounds) for keeping the nappies in... Will try and find a link. Of course, my sewing pile is quite large already... Those nap times are never long enough!