Funny you posted this today, I've had the same Eberlestock pack for a few years and just noticed quite a bit of a "creaking" sound coming from it today. I didn't think it had always done that, but I grabbed an older Kifaru pack I had in the shop and it makes nominal sounds as well. Was wearing a cotton tshirt. Maybe I think its louder than it really is because I am wearing it? My wife said she didn't hear it that well, so I don't know. Just my 2cents.