knew at the beginning not know if the 400 or the 600. Have decided ultimately for the 400, and that was a stroke of luck. Plenty of space, even my Nikon 200-400 is purely with mounted camera. In addition, within the backpack plenty of space for spare body and plenty of other lenses.
Processing: Top with lots of thoughtful details.
A perfect backpack for photo day.
Can only be recommended.
Kudos to Lowepro.