Travel cases for laptops are often bulky. Some barely fit under the seats on an airplane. Pictured is a nylon attache' received as part of a convention registration packet. It is large enough for a laptop. The handles and shoulder strap are strong, but there is no padding and only fabric not at all resistant to pushing and prodding from the outside.
Step 1: Beware the screen
Pressure against the screen of a laptop from even a finger poke can crack it. Once damaged, the repairs are so expensive that a new laptop is the only course remaining. Light cases made only of fabric mean no protection for the computer's screen.