Children's Bike Seat
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This is what I'm thinking of. A "children's bike seat". I think they would work out great in Haiti. Although I know they wouldn't put just one kid in the seat. They would throw two or three back there. Just like the Haitians say, "There's always room for one more."
I had no idea they were so hi-tech these days... Mine looked nothing like this when I was a tyke.