Plastic "Baggies" for metal and hard plastic item wrap and some of the very thin blue or pink foam sheet packing material to fill the voids and prevent rattling

I used a small strip of small bubble wrap. Has the bonus of you getting to pop some if you have to use it and need to release some frustration.

:-p

I have a Speed Concept and have been sticking my flat kit (tube, CO2, Inflator, levers) inside a beer coozie. One of those cheap thin foam ones. It fits perfectly and then that whole thing goes inside the Draft Box. Works like a champ and it's dirt cheap! (and quiet)

Have the Q box. I stuff a tube and some self adhesive patches in the top cap of the box. Levers, multitool, second tube, etc go vertically into the box. I just wrap that stuff in a paper towel with no rattles.

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Don't drown. Don't crash. Don't walk.