It's a fancy little backpack that I read about on one of these threads.

I got it at The Container Store. My kids are finally old enough that we are going without a stroller and a diaper bag. I know I still need something to carry the cameras and such and just didn't want a big backpack. A little pricey but I am hoping it lasts me forever.
Baggallini makes different kinds of bags, not just backpacks. The bags are designed by flight attendants to make travelling easier.