I just counted up my packs:
My first Osprey pack — 36 L Kyte, 2013 purchase. Went on my CF in 2014. No side zipper. That is the one being handed onward to a friend who can repair the elastic bottle holders and pouch to take on her first camino.
45 L Osprey Talon — this is the one I use for major shopping at the farmers’ market.
22 L Osprey Mira — until Work From Home this was my day-to-day pack for carrying all my work crap. *Almost* took it on my CP, but things were too crammed in to be easily accessible during the day. I do use this bag on the endurance trek I do in deep winter: 65 K in one day as a charity effort.
36 L Osprey Kyte — dark blue, this one went with me on my second CF, and on my CP and the side zipper for access that didn’t require unpacking the bag made it the easiest bag I’ve ever carried. That one stays at my shack in the woods so that I always have gear to go.
36 L Osprey Kyte — teal blue/green — this is the pack that will go on any future camino, and will be my day-pack for hiking out/back at home. I like having a place to carry my lunch and snacks separately from a change of the shirt, socks, and so on, and plenty of room to store my allergy and asthma meds (those are *chunky*). And room to spare to pick up a bit of groceries on the way home.
6 L Osprey tempest — this is a hip-pack where I can stuff snacks, meds, phone, and 2 hydration bottles — as well as a hydration bladder if I want. This one goes on the endurance trek because I have to eat in the dark on that one, so easy access is crucial. I also take this little pack if I want to be a minimalist and not pick up anything and can also get away with not carrying stuff for anyone else.
Maybe it’s because I don’t drive, so these packs are my “trunk” in many respects. But they are all in pretty regular use.