Model:B633EF47237GH4322 Waterproof Material: Waterproof Oxford fabric, comfortable, soft, and durable. Long service life.Abrasion-resistant, water-resistant, scratch-resistant. For all outdoor activities such as running, training, jogging, hiking, traveling, cycling, fitness, etc. Adjustable Belt And Large Capacity: backpack size: about 18*10cm/7*3.9 INCHS, with a capacity below 20L. Perfect for carrying your cell phone, keys, wallets, bank cards, glasses, etc. Reflective belt: The hiking backpack uses a reflective belt design, the reflection effect will be enhanced at night or in a dark place, attracting the attention of drivers and pedestrians, and providing security for your night travel. Headphone Hole: The headphone hole design allows you to release your hands, and you can also answer calls and listen to music during exercise, to give you a more pleasant and relaxed sports experience.