I don't understand people who take money and send stuff out inadequately packed.
That said, my choice in packing materials tends to raise eyebrows - When I know I've got parcels to send (like now, for instance) I make sure that I've got an ample supply of rubble sacks (preferably not black, but more on that in a second). Besides the main structure of the packing (which a tight wrap will help with), it means that the package it means that there's a tough, waterproof one piece outer cover. This has only caused problems once, when I sent something off (not audio) to what I can only describe as a classic Karen.
The book had arrived, in perfect condition (a difficult to find book on cake decoration.), because I'd cut and stuck a custom carboard box with hot glue, used plenty of padding and given it a black (in this case) rubble sack overwrap. I'd given my telephone number in case of issues (I don't do that any more...) - and answered the phone to what I can only describe as a Tirade of Karen. Although this was a good 15 years back, before Karens started their merry dance across the Internet, so it must have been a rare proto-Karen. There was no problem with the book. There was no problem with the time it took to receive the book. The problem was that I'd sent the book in... sharp intake of breath... a bin bag. She wanted a full refund. She was going to kick, scream and complain to everyone because I'd sent the book in a binbag. I even had ebay ring me (well, one of their customer services). Even they sided with me, once I explained. Sod all chance of that happening these days...
I still use the rubble sacks. Best outer packing ever.