I have the ThinkTank"s Mindshift BackLight Elite 45L.
Get deeper into the backcountry with the BackLight® Elite 45L backpack. 45 liters of available space provides ample room for camera gear, adventure equipment and a tripod.
www.thinktankphoto.com
Inside the removable (included) camera main compartment it can hold :
- Sony A1+ 200-600 with hood attached and ready to shoot .
- Nikon z9+800mm pf hood reversed PLUS Sony A1+ 200-600 hood reversed.
its a tight fit for the z9 + 800pf both on the length and on depth dimensions . The internal removable camera compartment is a bit shallow so the 800pf hood needs to squeezed inside , its ok but a deeper compartment would be better (had the bag before I bought the lens). I don't know how hoods of 600f4 &400f2.8 will fit though
- there are nice sized front , top and laptop compartments to carry extra hiking staff
- the removable camera compartment have its own shoulder straps and can be turned into carry-on if the whole bag is not allowed (the bag is on the verge of carry-on regulations)
it saved me already ....
- very good waist belt and lumbar pads padding for a photo backpack
- good sized side bottle pockets.
-good attachment straps , and tripod attachment system
-khaki colored rain cover
-there's an option for top access to the main camera compartment. I don't use it , so can't comment how is it in the field.
* it can even carry the z9+800pf with its OEM hood attached when the top access is open - but the top access zipper can't closed that way just the top lid so no padding or rain protection
- One potential drawback is that the bag have no torso adjustment, and its torso length is a bit large for women or smaller men . for me it's just smidge larger than I would like