Here is a travel bag suggestions for those interested

I now have three sizes of the Mindshift Backlight series of backpacks, 18lt, 26lt and 36lt. The latest one I have just purchased is the Backlight 18lt, the smallest in this series as I wanted something smaller for travel purposes.

I like these backpacks because they have the opening side towards your back so that when you swing them off your back, the opening side is facing up so you can immediately get to your gear and the side that is on the ground does not go against your back so as to minimize getting your back dirty. You can also leave the belt strap done up and swing the bag around your waist and have the bag in front of you and facing you so as to access your gear without having to put the bag on the ground at all. It is also safer as no one can unzip the bag whilst on your bag and steal your gear.

Mindshift 18lt with the Z8, Z24-70 f2.8S attached, Z 14-24 f2.8S, Z 50 f1.8S and 180-600 f5.6-6.3 VR and spare batteries. I am also getting the Z 24-120 f4 to take on my travels instead of the 24-70 f2.8. As you can see, this would be good for those that want a set of lenses for general travel photos and also for wildlife. As you can see, you could swap out the 180-600 and put in the Z 70-200 f2.8 VR S, or Z 100-400 f4.5-5.6 VR S, or 500 f5.6 pf or 600 f6.3 PF etc or a couple of short primes if you are doing street.

The bag is "relatively" small compared to some others and there is plenty of room in the back pockets for ancillaries and a small laptop.

There is the Mindshift Backlight 26lt

and the Mindshift Backlight 36lt