How do I recharge the bag during the winter months?

The bamboo charcoal bags only need UV light in order to recharge, the temperature outside does not matter. As long as the bag is in the direct sunlight for at least 1 hour, once a month, and your bag will rejuvenate. Although the summer months may increase the speed of the bag recharging, it is still completely possible to recharge the bag outside during the winter months.