Here's the thing: am driving to a shopping mecca 500 miles away with DS 5, DD 3, then am dropping the vehicle and flying home. I'll have my one large luggage piece for all of us plus 2 car seats to check then I have to decide what we'll take as carry on luggage. I'll probably use the packabe as my diaper bag while travelling around shopping mecca doing shopping and visiting...

DD wants to take her mini, DS wants to take his trunki (can't decide if I'm going to let him take such a big carryon for the plane, probably have him carry his school backpack... and I'll have to choose which bag I'm going to use as a carryon:

Packabe, BeFab, MB, tween or be prepared. I don't need to have a lot in the carry on, (snacks, change of clothes for DD and...)so I can't decide which one to use.

WWYD?

Probably the PB to give you an option of handsfree...however, if you pack up your MB with what you need, and it works, go for it! I love how light the MB is and it fits easily under the seat.