When working with professional camera equipment in extreme cold weather, all items would be double bagged in ziplocks before bringing back inside to room temperature. The danger to the electronics within the camera is the condensation when warming up after being brought inside. With double bagging, the condensation would be take place on the outermost baggie. The gear would need to thoroughly adjust to room temperature over several hours before removing from the baggies. For long term storage, @lpretiring’s suggestion of vacuum sealed sounds good - as long as each bag is sealed individually - and is double-bagged.