The bag is made entirely of Thermoplastic Compound, a resistant, flexible, waterproof, easy to clean and maintain expanded plastic material. This model features a metal hook closure on the flap and the removable shoulder strap offers comfortable shoulder portability.To avoid variations in shape and color, do not leave the body exposed to the sun and/or high temperatures. To clean the body, use O Clean or a neutral detergent and a damp cloth.In addition, the O Bag models have interchangeable parts! Have fun creating the perfect combination for your O bag, choose a body from the many colors available!