Always store the firewood under cover and in a well ventilated area. We always recommend that the bulk bags are decanted, however if you are lucky enough to be able to get the bag direct into your garage, then it will be fine left in the bag. If outside, you should really cover the bag as if water gets in, then the logs may end up going mouldy as there will not be enough airflow. Don’t forget the bulk bags are only showerproof and NOT waterproof. The small bags do have little breathing holes, so are also not waterproof. Again, best stored under cover.