I just wanted to post a rave for this MONSTER sized bag! I was a bit hesitant before ordering it since the measurements given seems SO big, but I figured it had everything I was looking for in a bag so I'd give it a try. Well, I am very glad that I did. I love it more than I ever imagined! I decided on the WannaBe for several reasons: a) the cooler pocket. We go to the zoo a lot and I generally have to drag an insulated lunch sack in along with the diaper bag; b) the outside towel holder. I don't use it much for a towel, but I wanted it to hold my wraps (for wearing my LO) and the picnic blanket; c) the electronics pockets. I just loved the idea of having those available; and d) it could be used as a backpack.
Now, I have to say that not one the items above have disappointed me. I find the backpack straps comfortable and prefer to carry it this way and the straps on the front have been as invaluable as I thought they would be for wraps and picnic blankets. Above all, I have been incredibly impressed by the quality of the JJB bag. I wasn't expecting it to be so well made and so light! I also love the Tiki Toffee. It goes with everything and isn't so bright since this is such a MONSTER bag.
In short... this is a GREAT bag for longer trips when you'd be carrying multiple bags... however, I find it a little large for my runs to the grocery store or the mall. Also, it doesn't fit in the stroller's basket (I have a Phil & Ted's though, so not much room period) which is also a negative, but since it has the backpack straps I haven't found it to be a problem at all!