I purchase a cheap nylon pack liner, you know, roll top closure, might be 70D coated nylon to make it waterproof. I recall it's a Mountain Designs 75 litre one, Lovely bright green so you don't miss it when it come through on the conveyor belt.
I can fit my Osprey Exos 46 large in it easy. Just slid the pack in and roll down the top tight and buckle it up. I have a small cable travel lock which I put through the roll top buckle to make it all secure.
Works great as you can use the rolltop like a handle and theres no dangly pack straps etc hanging out to get caught and any abrasion is against the pack liner, not your pack.
I've done this about 6 times now for international flights. The pack liner's looking a little sorry with black scuffs etc that you get at the airport but the packs never damaged at all. Small price to pay and the liner was only like $20 anyway.
Quick and easy too, I carry my loaded pack to the airport just like a normal pack. Just stuff it in the liner when your waiting for your ticket. Same when you land and get the pack of the converyor belt, just undo the buckle, slip the pack out and off it goes on your back.
The pack liner could also be used on the actual trip if you wanted but there are lighter options and I've always had someone to leave some gear with.
It stuffs easily into a side pocket etc once removed or prior to the flight while your wearing the pack.
I guess you couldn't do this with a huge pack as you wouldn't be able to fit a huge pack "into" the liner, but hey that's one advantage of UL Backpacking.
The biggest reason I like this way is because it's quick and I can travel too and from the airport with my pack… as a pack. No bulky duffle bag or rolls of tape, garbage bags etc.