Several years ago opened
my little mail slot and there was a 
package from anime-cel.com rolled up to
fit slot.  About had a heart attack, til
package was opened and cel was curved but
not bent.  It eventually straightened out.
Chewed the postperson up about it as I guess
they couldn't read 'do not bend'.

Another package from Animanga w good packaging
was only thing that saved cel.  When got box
looked like it had been chewed on and also
that someone may have eaten dinner on it - but
cel inside was okay.