Same principle that I use to air layer. When I do this with camellias I use plastic grocery bags, electrical tape, aluminum foil, and a bucket of wet sphagnum moss. I select a good sized branch then scrape the bark down to white color, put the sloppy wet sphagnum around the area, wrap with the plastic bag, then I wrap with aluminum foil and tie off the ends with the electrical tape. I do this in the spring before it gets too hot and leave until autumn to cut and re-plant. All bets are off if we have a storm that year. I have been doing this for years and I don't lose many. I hadn't thought about figs but good idea using those Gatorade bottles, and they certainly look neater than the aluminum. Thanks for the photos.