I'm glad I persisted with figuring out how to use the sling (thanks to Corinne). It's damn useful to have around. In addition to using it as a blanket and something to wipe baby's nose when I run out of tissue (!), I used it as a shade for Kai in the car during our trip.
The Australian sun is notoriously strong, and despite Adeline's tip to bring a shade for the car, I forgot all about it. So I draped it over the car seat, not only giving him respite from the sun, it proved very conducive for napping.