Yes, my teacher's "coffee mug" rarely varied off the path between his desk and the teacher's lounge but, even if it did, it never went as far as the lab.

I often use empty food containers like snap-top margarine tubs and plastic milk jugs in the darkroom because they are free and plentiful. I can use them a couple-few times and, when they get icky, I can throw them into the recycle bin. There are always new ones to take their place.

These containers are always labeled with their contents but, most importantly, the path from kitchen to darkroom to recycle bin is always a one way street.

Nowadays, if you blew the door off a fridge, you could easily get 1,000,000 hits on YouTube!