car seat carriers

[justhat]

I need some help finding a car seat carrier to hold our Britax Marathon or Roundabout when we fly. We always get our daughter a seat on the plane, so it won't need to be checked, but we do want it to be durable. Basically it will just be used to carry her carseat in and around the airport and onto the plane. I'll be flying alone with her in a few weeks and am thinking of taking one of these seats instead of her infant seat since it might be easier to wear the Britax on my back, than carry the infant seat around. Anyone know a good car seat carrier that will fit these car seats? We'll usually take the Roundabout when we fly, but I'd like the bag to fit the Marathon too in case we take that one instead. Also, I'm thinking it would need to have backpack straps, not just an over the shoulder strap, so I can wear it while carrying my daughter in the Baby Bjorn, but if people have had better luck with just one strap I'd love to hear that too. We've seen the following online and in stores, but want to make sure we get one that holds up so we're not buying a new one in a few months.

J.L. Childress - Ultimate Car Seat & Booster Seat Carrier (~$45)
Prince Lionheart Car Seat Tote (~$25)
Graco Car Seat Travel Bag (~$20)
Eddie Bauer Car Seat Travel Bag (~$20)
Dex Products Hands Free Car Seat Bag (~$27)
J.L. Childress - 4 in 1 Car Seat System (~$35)


(You can see all of these at Car Seat Carriers if you're not sure which one you have and like or dislike.)