Sterkmann Expandable Carry-on Backpack for Men Overnight Weekender Waterproof. Almost never used, I think just once, and this backpack isn’t made anymore. BUILT FOR THE ROUGH & TUMBLE OF TRAVELING - Our carry-on luggage is made of waterproof backpack-coated eco-polyester. Exterior zippers keep moisture out. Reflective print lets you stay visible at night. EXPANDABLE & VERSATILE—This laptop backpack, work backpack for men, or backpack for women expands from 20L to 30L capacity. Tuck in the straps to carry on luggage. The airline approved it as a briefcase, which instantly gives it a professional vibe! It fits up to 15" laptops. STAY ORGANIZED Travel Essentials It has 3 main compartments, an organizer, 12 inner pockets, and 2 elastic side pockets. Travel cubes easily fit inside, find what you need! ERGONOMIC & COMFORTABLE -travel backpack Breathable thick-padded back cushions, backpack for travel contoured and padded shoulder straps, soft-padded top handle ensure comfort. A sternum strap spreads out the weight of the backpack. IMPORTANT REMINDERS: The waterproof zippers are stiff at first but open more smoothly in time. The heavy-duty materials make our bag weigh more (3 lbs / 1.3kg). If you prefer a lighter bag, this backpack might not be the best choice for you. It expands to carry clothes for a 3-day trip.