Makino Waterproof Travel Backpack Outdoor Hiking Daypacks Shoulders Bag 40L Material: water-repellent and tear-resistant Nylon [Great Capacity]: Capacity: 40L, Size: 21.65"*12.20"*6.30". Rugged internal frame backpack with great capacity with hidden pocket large enough for 2-5 day trips. Perfect for outdoor activities like hiking, climbing, camping, running, jogging, walking, cycling, fishing, travel, vacation, beach wear, can be also used as a student bag [BES System]: Multi-position adjustable torso adjustment fits wide range of body sizes, adjustable, ergonomic shoulder straps with sternum strap and hand rest, perfect for mountain climbing, long hiking, traveling and urban daily wearing [Water-resistant Rainfly]: Integrated water-resistant rainfly at buttom of bag [Air Flow System]: The back and hip padding made of durable open-cell foam with lumbar pad and molded channels provides maximum comfort and allows airflow [Easy Clean]: Banister brush wash / hang dry suggested, water temperature no more than 40 C