Water-resistant and DURABLE. The backpack is made from highly rip and water-resistant nylon fabric, which provides strength and long-lasting performance, with minimal weight. Stress points are reinforced with bar tacking for increased longevity. We use durable 2-way Abrasion Resistant SBS Metal Zippers across the backpack. COMPACT. Folds into zippered inner pocket to fit anywhere. Unfolds from pocket to backpack. A must-have on any trip and a great gift for anyone. Dimensions: Unfold: 18.5x13x7.5 inches, Fold: 8.5x8.5x1.2 inches. LIGHTWEIGHT (0.7 Pounds) and ROOMY (35 Liters). A true space saver. Stuff the bag into its own pocket for storage and unzip it when you reach your destination. Avoid overweight baggage charges by simply unfolding it from your luggage and using it as a carry on for your excess baggage. MULTIPLE COMPARTMENTS. Features a classic shape with several pockets for storage and organization. This backpack has a roomy main compartment, two front zipper pockets to hold small accessories, and two side pockets for water bottles or umbrellas. NEW VERSION: Includes aluminum CARABINER, WHISTLE buckle, and REFLECTOR. The included carabiner clip so you can attach things or clip it to things; the chest strap with a whistle buckle help you lock your backpack in place securely. NO FLAPS WITH THE ZIPPER, never struggle with zipping the compartments again! Get Outlander backpacks, dont worry about zippers that catch onto flaps.