Carseats

One big question we have had as we plan our journey is what in the world we should do about car seats. In the states we can rent a car seat along with our rental car without too much hassle. Once in country, most places can be accessed by mass transit and car seats won’t be necessary. It is only where taxi travel is the norm that a car seat would be necessary, and the thought of lugging around two car seats all day in developing countries that may lack seatbelts in taxis seems a little much. So, I stumbled across this on Amazon:

http://www.amazon.com/RideSafer-Travel-Vest-Size-Small/dp/B000HRR8OC/ref=pd_bbs_sr_3?ie=UTF8&s=hpc&qid=1226525532&sr=8-3

Is this thing for real? It looks like it would only work for Abi because of the weight/height requirement.

I would love to hear from anyone that has ever traveled with young children in the developing world. Would something like this work?