What is the best way to protect an internal-frame pack from the savages of air travel? My 65L pack is too large for a carry-on, but I would like to find it intact upon arriving at my destination, if possible.
Take a couple of heavy duty rubble bags (from B&Q etc.) stick your pack in one, place the open end of the first bag into the second bag and wrap up the resulting package with some gaffa tape (take a smaller amount of gaffa wrapped around a permanent marker or similar).
It is a good idea to have the grab handle of your rucksack (or suitable bit of spare webbing strap) sticking out of the package so the baggage handlers have something to grab.
Save the gaffa at the other end for the return trip, use the rubble bags to keep your kit dry in the pack while you are there.
Certain airport authorities (Africa for instance) sometimes want to see the contents of your pack before you enter the terminal building so do not wrap it until you are safely inside.
This setup has worked for me for years, if nothing else I don't have too much extra weight to carry at my destination.
The wrapping service provided by some airports as mentioned above are very good and well worth the couple of quid. Not only does it protect the bag but also discourages any "tampering."
"...NEVER under any circumstances leave anything in your pack you cannot live without..."
Just never travel by DELTA Airlines ( Don't Expect Luggage To Arrive) A trip to Florida to backpack back around the Gulf coast and then up to CA saw My pack in......NEW YORK!........after 4 days in the same god forsaken Motel ( courtesy of Delta) I was ready to die...., thank goodness the motel had a bar and a pool! One tip I learned is this... NEVER under any circumstances leave anything in your pack you cannot live without, such as your credit cards and driving licence for example... glad i had $150 in cash.......