Trusty Hoover upright vac is running on it's last bag. So I note "Vacuum bags" on the shopping list on the refrigerator door. Then I look at the vac for a model number to put on the list. Damn, no model number or name (e.g. Supersucker 1234) on the vac. I turn it over, no luck. Hoover didn't bother.
So tomorrow I'll be in the supermarket looking at a dozen different dirt bags wondering which one will fit.