This bag measures  14x21x2 and has about a 20 liter capacity.  There are three outside pockets, one of which has a clear front to store information you need to quickly see and access.
 
There are also pockets for storage and pens as well inside the main pocket.
Inside is a slip pocket to store a computer or document files.
The bag has a double, heavy duty zipper for easy access tothe main pocket.  
 
The bag is double stitched and has military grade shoulder straps with a front chest strap for comfort and security.
 
These bags are made in one color unless you want to add additional ones, but there is an additional cost, please see below and add as appropriate to ensure you get what you want