Its compliance with the U.S
I dont know about you, but getting my 3 year old and 1.5 year old to pose for a picture is nearly impossible
While I think airlines generally wouldnt have a problem with it, most of them dont address whether or not carriers are allowed as gate checked luggage or in the overhead compartment on their websites, and American Airlines doesnt even allow gate checking both a stroller and a car seat, (though most of the others, like Southwest, Delta, Alaska, and United, all allow both, and we havent been questioned about taking our travel stroller into the overhead bin often either)
It has two main zip compartments, padded straps for shoulder and back support and can also slide over your luggage trolley handle
It will get them when other frogs just won't