Makino Men's / Women's Casual Waterproof Travel Backpack Outdoor Unisex Shoulders Bag 5426 40L/45L/50L Material: water-repellent and tear-resistant Nylon [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 [Great Capacity]: Rugged internal frame backpack with great capacity with hidden pocket large enough for 2-5 day trips, multiple choices available: 40L / 45L / 50L [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