Looks very nice. I broke down and bought Shimoda X50 with inserts for supertele lens and it
does fit 600/4s TC. No idea how it would compare to Nya-Evo though but I have to say, like my
other Shimoda backpack, it is very very comfortable to walk around with this backpack over extended
period of time.
I picked Shimoda mainly because it is availble locally and I could go to a store to try it on before
buying it.
This is exactly what I think as well... - from the review ( good review btw.)
"Of course, it’s not just size that airport staff care about — weight matters too. To be honest, I’ve never quite managed to stay within the official carry-on weight limits, and so far, it’s never been an issue (knocking on wood). But if you’re hoping to stay on the safe side, keep in mind that the empty pack weighs 2,400 grams (5.3 pounds). Be sure to factor this into the total weight of your gear and other accessories."
This is why I ended up with so many backpacks
Moose Peterson MP-3 is the lightest and it is great on a trip where weight is severely limted
but I don't have to walk long distance with it such as trip to Africa.
Trip where weight is not so restricted, there are other much more comfortable but heavier backpack
available.