Back compartment padded to protect laptops up to 17 in size, Dual Laptop Protection System uses a high-tech ABS honeycomb frame to protect laptop from exterior impact and a 10mm high-density foam to help absorb shock and prevent moisture intake , Smart Attachment Strap & Smart Zipper Attachment allows transport on extended handles of other rolling cases and luggage , Bonus! Protective Weatherproof Cover , Advanced, non-slip, shock absorbing neoprene Comfort Flex Shoulder Strap stretches for comfort, alleviating body strain.