I have the outside baby backpack/cooler. It is a really neat idea but unless you are carefull it can get heavy! It will probably be better when my son is a little bigger and needs less stuff.
Our last trip inMarch I used a clear backpack for all of hos stuff and it was so easy. Never had t open for security and even had several security guards say how happy they were when they get the clear packs through the line. I will probably keep using it every trip.