I've been using an Otter for a battery box for a while, and that is pretty well packed. Should be fine, but I've heard soewm stories about having to pry them open after a flight.

And the tape around the vial should be fine. In addition to the amber glass, I use a label around the vial that has all the directions for using PA. The bottom is open, just so I can tell quickly which vial I'm using- the Immodium in the other vial won't make bad water good. I figure that what little light reaches them during the monthy repack of the PSK should be too bad, becuase the origional bottle had an uncovered bottom.