Disaster!!!!!
Had it happen a few times, many years ago..........never again.
A similar thing will happen with stubbies floating around in esky water.......they bang together and break the seal on the caps.
There's a few things you can do, but they all involve stopping the cans from rubbing together.
You can.......
........drink all your grog before travelling
........pack the empty space in the esky/fridge with towels (it helps, but they can still rub)
........put a rubber band around the top and bottom of each can (gotta pack to keep the cans upright)
........put cardboard 6-pack carry boxes from Crownies in the fridge to separate the cans (my favourite
.....drink beer, use box....too easy)
Just a few suggestions.......I'm sure there are plenty of other ways.........