I figured out a way to store all the accessories I own in the case that came with my X-Mod. I just use a bunch of 2"x2" ziplock bags. I put everything in them, the motors each get a seperate motor, the gears that go with the motors go in bags according to color... You get the idea.
Here is a list of everything that is in my case:
IC3 4 Batt Charger
RSX Car
Remote
4 AAA Batteries
1 9 Volt Battery
Foam Tire Kit
Suspension & Steering Upgrade
Tire Upgrade
Stage 1 Motor Upgrade
Stage 2 Motor Upgrade
X-Mod Tool Kit
Spare Parts left over from the All Wheel Drive Upgrade
All left over stock parts from various upgrades.