Beer Flash: Flensburger pilsner (Germany)

I saw this bottle at Irving Wines and Spirits and thought it looked neat. For $3, it's 11.2 oz of basic, no-frills pilsner in a really neat bottle. The bottle has a pressure-lock cap, much like Rex the Growler, so it can be refilled and sealed. I'm sorely tempted to bring the clean bottle to D'Vines when I'm filling up Rex and see if they'll top off this little bottle.

EDIT: They will not top-off the bottle because it's too small to fit in the growler tap. :(