hatchlings

I came across this news story (with a video) about loggerhead sea turtle hatchlings and how the nest "boils" as the sea turtles emerge. The video is amazing, it takes a little while, but the nest "boiling" is stunning...

I have 2 parrotlet hatchlings and a home brooder but I need some way to take them on a car ride for a couple of hours. How can I make a portable brooder that will keep them safe and warm during trips?