Thanks everyone

I like the L.L. Bean Continental briefcase ( the design, not the size )
This bag size is around 20 liters.

http://global.llbean.com/shop/Continental-Briefcase/86912.html#start=1

I like the design (front admin/organizer pocket + main compartment + narrow back pocket for papers ) .
If there was a smaller version. Maybe 6-8 liter capacity

For some time I have considered the Maxped Neatfreak. Seems to be in that size range (IIRC), but it has too much pockets. I have several dedicated pouches (for meds, stationery, tools ..etc.) And I transfer them from bag to bag according to my needs for that day. So, a main compartment is necessary for those pouches.

Thanks