You can read about it here.
Basic idea is a sling that will help a mom who lives in the city get around while having to lug stroller, bags, and baby up and down steps and other non-stroller friendly areas... without having to ask a stranger for help! It will be interesting to see how well it works once it comes out. Right now, it is still under construction.
We use the baby bjorn (which looks a lot like this.. at least the carrier part) because that was what was on our registry when we had our first. It definitely helps to have our hands free while carrying the baby in certain situations. However, it does hurt the back after a while. Not sure whether I can visualize how I can strap a whole stroller to the carrier and carry all of it up some stairs... so I'm curious.
Don't think it will work for double strollers though... They'll have to come up with more inventions!
