DOUGO Laptop Backpack for Men and Women, Lightweight Backpack Waterproof Outdoor riding Travel backpack can be expanded to put basketball (Upgraded model)

【Wide Application】Adjustable outer bag on the back of this cycling bag can hold various kinds of equipment, such as helmets, basketballs, footballs, volleyballs, making it perfect for cycling, motorcycling, hiking, and mountaineering.
【High quality material】matte high-density anti splashing skin film, light skin, soft and sticky, wear-resistant surface, not easy to wrinkle, scratch, and leave no marks, easy to clean.
【High elastic and shock-absorbing back cushion】Honeycomb shock-absorbing and breathable material, tightly fitting the back without increasing the burden on the spine.
【Humanity Design 】This Helmet Backpack is made of waterproof and durable nylon fabric. Adjustable shoulder strap and back side come with comfortable and breathable sponge mesh design, which is good heat dissipation.(aterproof fabric, but the zipper is not waterproof).
【The Right Size】28(L) X 13(W) X 43(H) cm. Weight: 600g. Built for biking but also good for hiking, day trip and traveling!