Two weeks ago I bought a gallon of pickles, because I thought: Oh, that'll last me a while and its only $7 and I can use the jar for something after.
It did not last me a while, but I can still use the jar IG.
The only remaining decision is what for? My thought is to store beans in it (so that the beans don't have to be stored up high to be away from mice and so I can do a custom blend more easily, and then if I got a second gallon jar (of pickles or otherwise) I could use that as a dedicated bean soaking vessel, which would make it easier to remember to get beans soaking) or use it for making/storing lemonade (tight sealing lid makes the mixing easier, I can just shake it.) But I wasn't just going to commit to something without asking for recommendations.
Before you ask, no, there's no chance I'll use it for making pickles, I would never want to make that many at a time (though I definitely will get a smaller pickle jar for making fridge pickled onions).
Just so we all remember, Mass Extinctions usually don't mean anything like all species on earth dying. Like, even the big ones killed max like 75% of genera. We won't end life on earth unless we do a very impressive nuclear war or hit a runaway heating threshold that turns Earth basically into Venus, neither of which is even remotely likely. Possibly more sadly, all signs appear to be pointing towards most stuff staying alive and just suffering.