I posted a while back that I was dreading lugging a car seat and booster seat to Europe and that I was excited to find a much more portable option, the Bubblebum. (Side note: my daughter is old enough and big enough to ride in a booster, but I feel a five-point harness is still the safest option for her hence her car seat at home.) These things are so compact I can fit two in a suitcase. Anyway this past weekend I put one in my car and have had both kids try them out. Both kids say they are ok.
Below are pictures of Bubba on the Bubblebum. There is another part that can be used to secure the shoulder strap at a different height. I am not using in this picture but probably will on our trip. As an added bonus of these seats – I will be riding in the middle of the two kids for two days when our friend Angie joins us on the Rhine river. Using these seats will give me slightly more room.