1. Material: fabric + TPU2. Water bag capacity: 2L3. Large internal capacity of the backpack4. With mesh design, tear-resistant, water-repellent, durable5. Waterproof material to protect the built-in objects6. Quick buckle design, easy to disassemble7. The water bag is firm and not easy to tear8. With a straw design, easy to use9. Exquisite edges without burrs, no water leakage10. Backpack size: 48x23 cm, weight 350g11. Water bag size: 41x17cm, weight 120g