I gave away my only big plant, an 8-foot-tall bird of paradise. The rest needed repotting anyway, so I took them all out of their pots and buried the roots in a roughly 50/50 mixture of moist potting soil and perlite in a plastic crate.
I had a Philodendron micans on a tall moss pole. I took it off the moss pole, wrapped the roots in a damp paper towel, stuffed that portion into a Ziploc bag, and stuffed the whole thing into a clear plastic bag, loosely sealed.
I did the same thing to a Madagascar jasmine plant that had been vining around a bamboo arch.
Finally, I placed some smaller plants in a smaller plastic container with moist perlite.
Sadly, I had to give all my pots away. There just wasn't enough room or time to carefully pack everything. We were already a half day late getting underway with our road trip.
I'm thankful they seem to have all survived.
This will be my struggle in a year or two. I'm planning on moving a couple provinces over so I'll need to come up with a way to move them. Probably end up taking a bunch of cuttings instead.