You get two bags in one with the Tech Folio Backpack — a folio for organizing all your tech gear + a compartment that can store two devices or a change of clothes.  This backpack will keep professionals who carry a lot of cables, adapters, dongles, power chargers, etc. ready for any unexpected situation. 

For carrying big laptops, see  Tech Folio Tank Backpack.  Fits 17-inch and 18-inch gaming laptops and accessories.