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Ultra Lightweight: Product Size: Height 18.5 inches (47 cm) x Width 12.6 inches (32 cm) x Gusset 3.1 inches (8 cm); Weight: 0.7 lbs (0.3 kg); Capacity: 6.6 gal (2 Soft and comfortable bike backpack fits your body perfectly without any pressure. Made of high quality materials: The entire front is waterproof canvas, so it completely prevents the contents from getting wet with rain or water. In addition, the back surface and strap are made of highly breathable material that does not feel stuffy even when you are close to your body, and it has excellent breathability. Reflective Design & Supplementary Functions: The front of the strap is equipped with reflective lines, making it safe for walking at night. There is a straw fixing pin on the right side, so you can always refill the water at any time! Hydration System: The hidden water tube design makes it convenient to drink water through the water pipe. Straw clip on shoulder strap secures water conduit for easy use. Multi-Purpose: Not only can it be used as a running bag, but it can also be used for various places such as marathons, cycling, jogging, walking, hiking, trails, etc.