J.M.
We bought the Cosco seat you see piled up everywhere from Sears to Walmart. It's around $60, very light, comes with a cover, and it is easy to install. Our primary seat is Britax, but we also wanted something for travel and to use as a second seat for my husband's car and Grandma's house. I was worried at first because it was so inexpensive, and didn't have all of the bells and whistles the Britax did. But when installed correctly, it passed the same safety tests as all of the other expensive seats. It's is so light and convenient to carry through the airport. However, your child does have to be 22 lbs before forward facing.