One of the options Dan and I discussed was making the shoulder straps and hip belt out of Spectra. Apparently, the salts left behind by sweat can induce small critters to chew on them. Who knew? I've never had a problem, knock on wood, so I passed and went with regular fabric. Good reason to give your pack a wash on occasion.
I have had exactly that thing happen to a shoulder strap. The mouse ate the webbing and chewed up the fastex buckle though.
