I put a towel inside my backpack to prevent the contents from rattling. I do up the straps quite tight and if needs be I put socks around the straps so they don’t chafe against my neck. If the pocket where I keep my phone and keys is not tight enough to stop my keys from jangling then I stuff a flannel in as well. I also put hairbands around the zippers to prevent jangling noises. I also try to finish the contents of my water bottle in one go because I don’t like to have a half full bottle sploshing around.
I put a towel inside my backpack to prevent the contents from rattling. I do up the straps quite tight and if needs be I put socks around the straps so they don’t chafe against my neck. If the pocket where I keep my phone and keys is not tight enough to stop my keys from jangling then I stuff a flannel in as well. I also put hairbands around the zippers to prevent jangling noises. I also try to finish the contents of my water bottle in one go because I don’t like to have a half full bottle sploshing around.