Lowepro Flipside Trek BP 250AW

Lowepro says it fits:

Mirrorless or compact DSLR camera
1-2 additional lenses
1 compact tripod (tripod and monopod) and/or trekking poles
"8" Tablet PC in the "CradleFit" compartment

Designed for photographers who need a versatile backpack to protect their camera and outdoor gear. The Flipside Trek perfectly balances the camera compartment and free luggage compartment and is equipped with all the features you would expect from an outdoor backpack.

50% camera compartment, 50% free luggage space for personal belongings. The flipside's body-hugging opening makes it possible to remove the equipment without taking off the backpack. The ActivZone harness system offers all-day wearing comfort. Multiple attachment points allow you to increase or decrease the amount of externally attached equipment. The integrated All Weather AW cover can be unfolded from a zipped compartment on the backpack lid to provide additional protection against rain, snow, dust and sand.
The padded CradleFit compartments provide support and protection for your tablet PC. Water bottles and other items can be stored in the stretchy mesh pockets on either side of the backpack.