One of the best camera backpack is available at an all time low price according to CCC. The 350 AW II can comfortably fits a full frame mirrorless/DSLR camera, 3/4 lenses + accessories. I own it and would easily recommend it to anyone who is looking for a mid sized camera backpack; it is extremely well designed, comfortable to wear and durable. It retails for $439 but it regularly sells for between $215-$300 in camera stores and on Amazon.
The description of the 350 AW II according to Lowepro's website:
High-performance modular camera backpack designed for standard DSLR or Pro Mirrorless cameras.
* 4-point access Pro Mirrorless/Standard DSLR cameras and lenses
* Waist belt converts to utility belt with included accessories
* Lightweight FormShell™ construction for superior protection
* New series of SlipLock™ modular accessories
* CradleFit™ compartment safeguards up to 13-inch laptop<
The larger Lowepro ProTactic 450 AW II is also available for only $210; not it's cheapest ever price but still a very good price.
Great price. I bought Lowepro 450 AW II for $320 a year ago.
Consider the weight of each bag when purchasing.