Expandable & Large Capacity: This large travel backpack with an expandable design gives you a greater capacity of up to 35 L. Unzipping to get larger storage space, you can easily fit 3-5 days travel gears. The carry on backpack meets the maximum size allowed by IATA flights, can be fitted overhead and under-seat, is good for a weekend trip, business trip. The TSA 180 degree zipper closure helps you go through the security check quickly Sturdy & Lightweight: Men's Travel Backpack is made of lightweight water-resistant polyester and anti-scratch material, which can provide protection on drizzle days. Zippers are easy to close and open. if you have any questions, please feel free to contact us, we will give you a satisfactory solution within 24 hours. Regular sizes are 18*12*7 inches; after extended sizes are 18*12*9 inches Convenient Design: This carry on travel backpack is designed with hideaway padded shoulder straps which can be hidden away in the zippered back panel when n