When Lady Magnon bottles her annual supply of Apricot and Strawberry jams, invariably she uses old 'Bonne Maman' pots; I'm sure you know the ones, they have gingham tops (see below).
However, before Bonne Maman cornered the commercial jam market, people used purpose-made jam pots, which were coveted, and used year after year.
In my more esoteric days, I used to buy antique jam pots. I liked the idea of such things having held home-made jams over several generations. I seriously considered the age and aesthetics of such objects could only improve the quality of the contents, and in a way I think I was right.
I used to have quite a lot of them. No doubt they are still around somewhere, but gawd knows where!
Anyway, here are our current Bonne Maman pots.They're not a patch on the old ones which are very chunky and heavy; they had real jam kudos about them.