Here is how I ship Fig plants {takes the worry out of being close}
I usually shake off a big amount of potting soil off, then I water the rootball and put a damp/wet bunch of newspaper on the top! Then I put a plastic sack over the rootball, That plywood is 1/8 " underlayment
I cut a long slot in it to let the plant go into it, then I pushed the plywwood down on the rootball and put the 3 wood screws (on each side) in that little piece of molding, Then I put that peanut packing stuff around the plant top to keep it from moving inside the cardboard box, the thing had a long trip to its new home but it is doing great there!
It might take a minute longer but what the Heck!!!