M.D.
I found that a nice back pack can serve well as a diaper bag. I went through many diaper bags in search of the perfect one that fit my needs. I ended up with a nice back pack, that worked great. If you are finding laptop bags that meet your needs, by all means use that. As a mom you have soo much stuff to tote with two small children that what ever little thing makes your life a little easier is definitely worth it.