1.[22-35L Expandable Design]Before travel laptop bag extended is 22L, dimensions are 16.5x12x6.5 inches, after extension is 35L, dimensions are 17x12x9 inches. You can expand the zipper and buckles according to your requirements. The carry on backpack has two handles on the top and side for easy switching between backpack and suitcase. 2.[Functional & Multipurpose]The back of the backpack is designed with a luggage strap, so you can secure the water resistant backpack in the suitcase. At checkpoints, the backpack for traveling on airplane can be ly unfolded 90-180 degrees, allowing you to quickly pass through airport security and keep things tidy. You can use a black backpack anywhere for international travel, work trips, camping outdoors. 3.[ Backpack]The business backpack is made of durable polyester fabric, and high density nylon lining for better tear resistance and waterproofness. The heavy duty backpack with metal zippers ensures long-lasting daily use. Serve you as well as a professional office work bag, travel essentials for business trips, weekend getaways, shopping & outdoor activities in daily life. Back to college backpacks are ideal gifts for back to college, graduation, Father's Day, Thanksgiving. 4.[Comfortable & Sturdy]The laptop backpack men is ergonomically designed to enhance support and comfort with thick, soft, breathable padding on the back and shoulder straps, effectively relieving shoulder and neck pressure while carrying; In addition, the lightweight travel backpack for men and women, shoulder straps have adjustable non-slip straps to balance the pressure on the back. Thick foam handles and shoulder straps make carrying and holding the bag more comfortable.