There is absolutely no comparison between homemade pickled ginger and the stuff you buy in the store. Especially if you can get your hands on young ginger from the grocer or farmers market. Try making this for your next grain bowl or store it in the fridge for sushi night (it keeps for months).
Storage: pack the ginger into an airtight jar with its pickling liquid and keep it in the fridge. This is a proper pickle, it holds well for up to a year.