I've got so many pairs of drugstore readers hanging around, I'd say it would be difficult to be without!
2 pair at work
1 in my vest pocket <<-- this is my goto pair of glasses as they are on my person
2 pair in my vehicle
1 at computer at home
1 at reading chair
2 extra pairs waiting to be repaired

I only have 1 pair in a plastic case, however.

Each is different but I need my glasses for any closeup work. It would be impossible to thread a needle or read the instructions in anything smaller than 10pt without them.