Think Tank's largest carry-on backpack, the Airport Accelerator can hold two DSLR bodies with battery grips attached as well as a 600mm f/4 lens unattached, a 17-inch laptop, a 10-inch tablet and up to two smaller lenses.
With a cable lock and locking YKK RC Fuse zippers included, you can be sure your gear is safe and secure, while the seam-sealed rain cover protects it from the elements.