I'm taking a couple plane trips later this year with my 2 DD's (just the 3 of us) & was planning to carry my little one in her Peanut Shell. I have a LE Backpack that I love to use for flights cause it's so big. However I don't think there's ANY way to make the two of them work together; so...are there any carriers that can work with a backpack on?? Or should I rethink the backpack & use a different diaper bag?