These heat sealed bags with zipper tops are the best vanilla bean packaging I’ve seen.
According to Garth at Heilala Vanilla, these bags are actually designed for coffee:
We vacuum pack in 2.5 kg bricks for storage. Then we repack into the 250g bags we sent you when we dispatch. They are actually bags designed for coffee. The difficulty is the bags need to be non-permeable otherwise the vanilla keeps drying.