Uno and Mega simplesafe case  stacking part
Free     Thingiverse     Justy_guy

Uno and Mega simple&safe case + stacking part

So there it is A simple case for transporting Arduino Uno and Mega without worries about damage The bed surface can be used to place label with firmware name or something You will need Uno 2pcs 10x82x58mm sponge one M3x20mm 25 will work ...

similar models —

Uno and Mega simple&safe case + stacking part alternatives
Arduino Mega Study Board
FablabMoebius
Toothbrush Cap
hectare3D