That's exactly the scenario- I bought a bottle of "Italian Seasoning" at Big Lots, tried it once, it was old and had lost it's edge, so dumped it, cleaned the container well, and gave it a second life for coarse sea salt carry. I think it cost 69 cents. Should have known better, which is what inspired me to try and get something for the trouble.

Subsequently, as a spice container becomes empty, I save them. The glass ones for my wifee's beads, the plastic ones for our bug out/RV use. The cheap one was cheaper plastic and eventually cracked, but the Schilling containers are made from a thicker pliable plastic that seals well. And they're small enough to be portable and still have volume.

FYI- I carry, besides salt and pepper, ground cayenne (it can make the sorriest groundhog palatable-kidding, nothing does), sage, and oregano. My wife carries white pepper and has even kept soy sauce and sesame oil in them, although we have seen some seepage on occasion with the liquids.