TIE A CORD AND OFF YOU GO: MORE SUSTAINABLE AND EVEN MORE STYLISH . The Colorado Jungle Series Backpack from Doughnut is for the adventurous among us. The drawstring closure, the ability to attach extra luggage and the comfortable carry will help you on your next trip. Plenty of storage space on the inside and robust on the outside - so you can carry your utensils on your back in complete relaxation.The Jungle Series is made from more sustainable materials such as Nylon Plus and a recycled lining.