This is how I transport my most delicate minis. I wrap them up in tissue and then put them in a box.
The next way is for MARINES ONLY as they are so, so, so sturdy I just shove them in a box then layer the tanks on top.
This is a similar way but in a tool kit allowing me to put more delicate things on the top piece (not shown) and the rest in the bottom.
The final way is in a case. now with most of the guys I just fit them in as there isn't enough holes otherwise. More important and metal models get put in proper places.
So, how do you transport your models?