Bag and Freeze
Store tarsal glands in a freezer until you need them. Vacuum-packing is the best way to avoid freezer burn and extend their serviceability. Otherwise, put the glands in a double layer of sealable plastic bags and squeeze out as much air as possible. During the season, thaw and store them in a refrigerator between daily hunts or back in the freezer for longer periods. Kept correctly, each gland will give you about two weeks of good use.