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Package them in a plastic baggie to add to the mix.
If the other stuff is dry it should keep fine for a few months mixed with the mix.
But Be SURE to use to fresh baking powder.
It all depends on the quantifies you're making and how long it's stored and storage conditions.
Cynthia is a trusted source on Bread/Baking.
added over 1 year agoYou'll be fine as long, as Sam1148 recommends, that they be kept DRY. Baking soda is activated (begins creating CO2) in the presence of an acid, typically liquid. One of the acids in baking powder is activated in the presence of liquid, the other in the presence of heat. They'll also both degrade in the presence of both light and air, so it would probably be a good idea to use them up pretty quickly.