Amazon.com : MIYCOO Backpack - Ultra Lightweight Packable 。? HOT ITEM ? ?Lightweight: The lightweight packable backpack is about half the weight of a mobile phone, being folded into its inner pocket for storage and easy to open when needed. Unfolded size: 15.9 x 9.6 x 22.4 inches, folded size is only 4.9 x 3.9 x 7.8 inches ?Waterproof & Durability: The Waterproof backpack is made of waterproof fabric, IPX4: This rating offers protection against splashes of water, making them suitable for workouts or light rain. Heavy duty upgraded zippers and enhanced major stress points provide long-lasting durability against daily activities ?Large Capacity & Multiple Compartments: Hiking backpack with 45L capacity and 3 compartments. The carry on backpack featured a wet compartment for separating dry and wet items ?Survival Whistle: Equipped with a survival whistle on the shoulder strap, it is an essential item for your survival in dangerous outdoor situations ?Tips: Before traveling, you can put this collapsible bag in your pocket or suitcase, and when you buy more goods on the way, this large-capacity foldable airplane backpack will show its value BUNDLE AND SAVE??