Store them in a glass jar, preferably with rubber airtight seal. Choose a a size so that it doesn’t take more than 2/3 of jar volume. It can be dark glass but you still should keep it away from sunlight.
The new 2x10g were delivered in an air tight, light-proof paper-packaging. Should I just keep those closed until I need them, and then transfer them to a jar, or open them immediatly, transfer them to a jar, and drop that humidity control pack in there?