Frank, I went to bathroom (was this at my desk), dark bag dangling from my arms. Tried to put the whole bag under my sweater, covered the light coming from the window with my body, and squeezed the tank in from one of the arm openings. I didn't get any noticeable leaks on the roll, but never again!!
Helen, I don't have darkroom in my apt so I have to put films on the reels in a small change bag (It's a lot smaller than how it looks in the sketch). I forgot to put the tank inside the bag and didn't realize it until I already put one of the two rolls on the reel. To put the tank inside the bag, you'll have to make an "entrance" somewhere so I had to run to bathroom, darken the room as much as I could while the dark bag hanging from my arms. 😛