• [ULTRA-LIGHT]: The off-road backpack is specially designed for road biking/hiking, so this backpack is light, streamlined and stable on your back, will not produce a lot of wind resistance, keep your body in the best condition whether you want to train for a marathon Still riding a bicycle, it weighs only 120 grams (4.23 ounces).[WEAR-RESISTANT AND WATER-REPELLENT]: This hiking bag is made of 30D nylon waterproof fabric with a waterproof index of 2000 . It is the best