I recently bought a used Co-Pilot on eBay and have noticed that it makes a squeaking noise as I walk. This does not happen when I switch to my Nordic Pilot, so it is not my clothing or shoes.
It is a Black Ballistic/Wasabi Co-Pilot with the old zipper style and "Portable Culture" logo (love that!), which I carry cross-body using an OP/TECH mini-Absolute strap. Have yet to track down the source of the squeak. Maybe it's because of the non-TB strap (although I use the same strap with my Pilot without any squeaking)? Or because I do not fill the bag to capacity and there is lots of space for movement?
Wondering if anyone else has a squeaking Co-Pilot... And if so, what you did about it.