Roomy Space & Huge Capacity - You can fit more in this oversized travel backpack thanks to its expandable feature. Dimensions: 17.7 by 13.8 by 8.7 inches. When you unzip it, you'll find 45L of storage space—that's equivalent to a 20-inch suitcase box—that you can use to store packing cubes, makeup bags, clothes, camera bags, and other items. It's perfect for weekend travelers and occasional vacationers of all genders. Airlines approves this travel backpack as a personal item. It can be tucked under a seat or the overhead luggage rack without adding to the cost of the ticket. The major airlines have approved it. A 180° zipper closure makes it easier for you to breeze through the security check.