just a comment, I NEVER put tubes in the seatbag after having one puncture just by bouncing around in it. Bonus, I get to use a really small bag (lezyne micro), 2 levers, 2 co2, 1 head, 1 multi tool and 1 stick on patch kit. Tube in box in pocket for me.
It’s a bit bulkier, but I’ve been using a tool roll with individual pockets. It eliminates rattle and should mitigate any tube wear.