The first step is the copy all your data to the drive and "safely remove hardware" right before removing it. Next find an antistatic bag. It will need to be the one that looks like transparent tin foil.
Tools:
You will need a soldering Iron and a bit of patience.
I'm not sure the perfect temperature to get this to work so it takes a few tries. When practicing practice on some unused piece.
The following process will show you how to melt the bag shut in turn making it waterproof and protected from EMP and static discharge... we all know zombies drag their feet.
Here is me melting the seam. Please note it took two tries but I eventually got it

Here is the finished product... Sorry my camera sucks!!

I did test in a bowl of water. No leaks. If you leave a little air in there it will make it float as well!
It may even be wise to glue some foam the the edges to prevent smashing from other gear.
Cheers. Just another idea I thought up.
Here are my past ideas...
Commit Poppac’s - perfect to hold 10 AAA batteries {Picture}
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