My Great Grandmother was thrifty out of necessity. She made nearly all of her clothing. She would try to sew at least one seam every day on a dress or project. When finished with she would leave it in the machine and the next day the new seam would began with only a small amount of thread between seams so as not to waste the thread.
Her Domestic sewing machine, a treadle is still in the family and still sews.
As for me, I have a lot of bobbins with matching spools of thread. They are stored together so when I need a certain color I don't have to hunt up the bobbin to go with the color. I don't put them in pill bottles usually just on a shelf with the bobbin on top. Or, when I get super efficient I roll up a sponge earplug put it in the top of the spool and the bobbin on it. Keeps em together!