Made from?INVISTA's silicone coated 30D Cordura nylon material,?the Sil Daypack?resists abrasion, tearing and fraying, and has excellent water repellency and water resistance of over 1000 mm. This packable backpack is convenient for traveling, and can easily load and unload luggage with the diagonal zipper. The main body can be stored in the inner pocket. Actual measured capacity 18L.