Diaper Bag Help

I'm expecting my 3rd child in November and am searching for a diaper bag that will accomodate my needs for a newborn, a 2year old, and a 4 year old. Everything I see that may be large enough is only online and I'm not comfortable buying without seeing first. I would also prefer something that can hang off the double stroller. Any suggestions?

I had the same problem when looking for a bag big enough with enough compartments for my 2 kids (2 and 6 mos). I bought the Carter's bag. I love it! It has stroller straps to hang from the handle of any stroller. It has enough compartments to separate my diapers, for medicine, for disposal bags, bibs etc. I also love that the changing pad is attached to the flap so I never have to search for it. The strap is also long enough to hang diagonally over my shoulders and it is soooo comfortable! AND it was only $40. I got it at babies-r-us.