You'll enjoy this. That clear case is for shipping urine samples. Don't worry, it was new.
As you may know, our company produces videos for various health care clients. One was a drug testing company and the client came in with one of the sample containers. I took one look and thought hmm... leakproof, the lid locks and it's long enough for the REI Stormatches-perfect.
I asked and he provided us with a couple of dozen. I'm not sure where they came from initially but I suspect that laboratory supply companies would offer them at low cost.