Tire bag for Cervelo P2 or P3?

I have a P2C and seat is mounted on the forward mount. I’ve used various options to store tire, cartridges, levers, etc, however I’m wondering if anyone makes a good small bag that will fit with the seat so far forward. I’ve used an Xlab in the past, however after a few 70.3s realized I was carrying too much crap and didn’t need it. I just looking for a good small bag that may work.

I usually just use a plastic ziploc and put it in the jersey pocket, its the best option ive found. for an IM, Ill use a water bottle filled with my flat kit…

I use duct tape for spares and such. And seriously Jack back pockets?

Styrrell