The Neat Sheet - we picked this up at Toys R' Us for $8.99 (minus a $5 coupon, of course!) and it was worth every penny. It has weighted corners, is machine-washable and we used it for the beach, picnics, the pool, and keeping the sun off of Charlie in the pack. It is so easy to pack up and folds into a small little roll. See the details on it here.
Our Sherpani Superlight Rumba - we love this pack! After trying out every Kelty Kids, Dutalier and this one, we went with the Sherpani. We loved how this pack fit both of us, the features you get for the mid-range price and the comfort for the kiddo. It also has great storage and the look is very clean and simple. Without this pack, we would have missed some gorgeous sights. We bought ours at REI with a 20% off coupon during one of the members sales. It is $159 original price. One time I did see it at Steep and Cheap for $85 - amazing. Do you know about Steep and Cheap?
We have a Graco Car Seat Bag that isn't the greatest bag but it does work. And honestly, if we didn't have it, I don't know how we would have made it through the airport with Charlie in the Sherpani, two carry on bags and the car seat. It is really stiff and doesn't fold down that nice, doesn't pull that easily and it already has a couple of holes in it from a handful of uses. Good things about it are the cost (I got it for about $10 at Marshall's), it does have wheels and it fits my Britax Roundabout with room to stuff extra stuff.
Now that I know what is out there I would have purchased one of the following items instead of the bag, however. Before our next flight I hope to find one of these on Craig's List for cheap or to find a friend who has one I can borrow. These would be a great item to split with other families as you need them so rarely:
This is the GoGo Babyz Travelmate, which basically turns your car seat into a stroller. It is so easy to use and fits the Britax as well as many other car seats. Check your stroller and this is all you need to get through the airport. It retails for $79.95 at Target but there is probably a better online deal out there to be found.
A couple of items we didn't take but I like to recommend are the Pea Pod, that I reviewed in an earlier post. And also, the Kelty Kids Convertible pack which my friend Jessie took to Europe and loved. It isn't a very comfortable hiking pack but it is great for a road trip or overseas adventure where you would be on the move a lot.