I shouldn't even bother with a Gorilla box - simply put, they are crap:
a) The slightest knock will split or crack the case.
b) The wheels WILL fall off.
c) RAF loadies managed to smash a wheel and crack the lid in one journey.
d) They look rugged (but aren't), this normally means they get put on the bottom of pallets & will crack especially if a ratchet strap goes anywhere near them.
I'd look at buying a couple of the 'Pelikan' cases, fair enough they are expensive, but are spot on for what they do. The small ones are about a tenner and are big enough for a couple of smartphones, the biggest I've seen are about £80 and you can comfortably stick a laptop and other bits and bobs in it.
In case I wasn't clear, stay away from Gorilla boxes. If you are near any NATO bases don't buy one of the Ciano's boxes, as they are even worse than Gorilla's offerings.