I just tried my first lot of Microphen. I thought I'd bought a 5L kit, which I would have used diluted one-shot, but turns out it was only a 1L kit. So I'm keeping it in an accordion bottle and just resuing it.
Transfer it immediately to a glass or PET bottle or it won't be worth a tinker's dam when you go to use it. These accordion bottles are really worthless for storing developer. OK for stop and fixer.
A rock pile ceases to be a rock pile the moment a single man contemplates it, bearing within him the image of a cathedral.