they sell disposable pyramids intended for palletized cargo, the purpose is to prevent people from stacking stuff on top. In a modern cargo movement system if you have something on a standard pallet I think there's a low chance of anyone turning it on its side or upside-down, since that's just making more work for them vs. handling it with forks as intended.
We get pallets that use these that unfortunately come in crushed occasionally, though they do make inspection at the dock a lot easier. Another one that might worth similarly here is a tip-m-tell, which is basically some beads that will stick to adhesive if the package is tipped.
Luggage has changed a lot since this happened. I can still remember when the now-ubiquitous overhead bin–sized luggage with retractable handles and wheels came out and that was a couple decades after this event. I don't think that would have necessarily been an option. My recollection of my family's luggage when I was a kid was that there were pretty much full-sized suitcases and toiletry cases and nothing really in-between, plus everything was a rigid hards shell.
