Over the last several years I have come to really like the Brain Bag, Pslip and snake charmer. Prior to purchasing my bag I was carrying two laptop bags. It was quite a task for me and my back.
Given your designs I bet you would come up with the top notch iPod case, one for the head phones, charger, and flight power accessory pouch. All a person would have to do is with one quick reach grab this little bag or pouch.
I normally I carry two laptops and I am on the road often (every week if I want to be paid). I used to carry copies of my CDs for in the car - incase that I left them. Now I have a iPod with a car charger -transmitter, flight charger (can't transmit on the plane), and a plug in charger. Normally I use the Snake charmer but it is a little too big.
Your bag is great. I recommend your bags to all my friends.