I just leave them blank on bikes with extra mounts I'm not using. But I have looked at mount options for bikepacking and looked at the drjon strap deck. It's just a piece of mountable plastic with some straps to mount things like camp gear.
Mountain Biking
It's better when it's dirty
I mean if I don't need to use them, I'm happy to leave them unused. But I do want some sort of tool storage so I don't have to ride with a hip pack or camelbak on shorter rides. The Dakine Gripper I used on my old bike is just about the right amount of tool storage for me, but I just need a better way to mount it to my bike. As is, it just always slides down the frame after some bumps. Besides just being annoying, it also scuffs the paint on the frame after a while, so I'd love to find something similar that uses the bottle cage mounts instead of strapping onto/around the frame.
Pivot sells a handy "box" that's big enough to hold a tube, but I use it to carry a small multitool & my keys. It's compact enough to attach using the mounts underneath the top tube right above the shock on my Switchblade without getting in the way. And I actually bought it at a local dealer instead of ordering it online.
Ooh, thanks- this is pretty much exactly what I had in mind.
place a bikelock there or if you have a 3d printer get creative. fidlock is supposedly pretty good. dont know as i use a framebag and normal plastic waterbottles you can get at the supermarket.