Zipper closure COMPACT. Folds into zippered inner pocket to fit anywhere. Unfolds from pocket to backpack. Must have on every trip. MULTI COMPARTMENTS. Features a classic shape with several pockets for storage and organization. This backpack has a roomy main compartment, one front zipper pocket to hold small accessories, one internal security zippered pocket for valuable items and two side pockets for water bottle or umbrella. LIGHTWEIGHT (0.45 Pounds) and ROOMY (20L). A true space saver. Stuff the bag into its own pocket for storage—no extra fees, and unzip it when you reach your destination. Avoid overweight charges, simply unfold from your luggage and use it as a carry on for your excess baggage. DURABLE. The backpack is made from highly rip and water resistant nylon fabric, provide strengthen and long-lasting performance with minimal weight. Stress points are reinforced with bar tacking for increased longevity.