Your computer luggage; totes, briefcases and 
general bags for mobile & professional 
notebook use;

Computer bags-   Luggage of this kind is either wheeled or without wheels. If wheeled, the ride of course should be smooth and know how the bags handle retracts.  

Compartments - Is there a place for cell phone and also business cards?  What about accompanying computer presentation gear whether for compact projection equipment, brochures or catalogues.  For non pro's;  is there adequate organized space for your needs like an accordion folder segment?   Consider the overall organization as well (portable printer, auxiliary batteries, etc)   

Materials - Polyester vs. nylon vs. ballistic nylon vs. leather. 

Access* - Closures and their quality.   Features like flaps to guard out weather.  If important can access be restricted from the bags exterior?       
*Some models do come with locks.

Special Considerations (according to your notebook model) Can the pc be used  while encased inside?  
Or else is another sequence required to unsecure the notebook for working access?  

Find a computer backpack at Luggage Online