Ambient Air Packing or Vacuum Packing

We prefer to use ambient air packaging because it allows the continued formation of complex flavor components in vanilla and helps prevent the growth of anaerobic microorganisms.

We package our vanilla beans in ambient air packaging, which allows the continued formation of complex flavor components in the vanilla bean through slow oxidation. The ambient air packaging also avoids the growth of anaerobic microorganisms, which leads to the formation of off-flavors in the vanilla bean.

Source: Why We Should Not Use Vacuum-Packed Vanilla Beans