All Out of the Woods bags feature Supernatural Paper™ which is sustainable, washable, and vegan. Supernatural Paper™ is FSC®-certified (FSC® C175379) made of tree cellulose, a renewable resource, from responsibly managed forests. The insulation preserves the temperature of your bottled beverage for maximum enjoyment and doubles as padded protection for your bottle of choice for an afternoon at the park, an evening soirée, a midnight commute home.