Excuse me, but how 10 kg is limiting for carry-on? As long as you have reasonable gear for travel it should be enough.
This is an excellent question, and precisely what I am trying to determine.
If I was just loading up the trunk of my car, I would have little hesitation in adding an extra camera or two, a lens for every conceivable situation, filters for even the most
inconceivable situations, multiple formats of film, and at least one spare tripod. My humble Dodge crossover could also handle a cornucopia of accessories, gizmos and magic bullets as well. (Have I missed anything there?) Experience has taught me that I don't need half that crap anyway, and that there's nothing more foolish than running around a mountainside swapping lenses and cameras, trying to get that perfect image. It might work for some, but in my world, it only leads to distraction and disappointment.
The size and weight restrictions for airline carry-on don't allow for the ideal camera kit though, so apart from breaking my kit up between things I am brave enough to leave in checked baggage, and that which I cannot let out of my sight, other compromises must be made. I love my trusty Luna Pro SBC light meter; it's a standard tool for all my LF work, but it's a brick. Do I leave it behind in favour of one of my smaller, less-used meters? For that matter, should I just use an app on my phone? To be honest, I can't say I'm truly comfortable with anything but the SBC for LF.
I could just take two film holders, but I've never been a fan of loading film in the field. It works for some, but it does not work for family members waiting on the side of a trail watching my forehead bead up with sweat while I try to get the job done. So, I need more holders, but how many more?
Film, how much? How many sheets for 10 days of hiking? If I add my 35mm Nikon to my kit, I will have to account for that body, lens and film as well.
I could just take one lens instead of the three which usually reside in my kit, but which one? The long and the short of it, (and the medium, as well) is that compromises must be made. Keep in mind that every piece of kit that gets moved to my checked baggage must compete with other travel essentials such as socks and underwear.
I really am interested in how
Best of luck! Did you say where you are headed?
You live in an interesting area. Excellent for bird watching, I believe.
Thanks Frank. Point Pelee is indeed a beautiful area, but I'm originally an Ottawa Valley boy, so my heart (and my photographic eye) seeks out hills and thundering rapids.
This trip is actually my wife's retirement adventure. (Congratulations to the lovely Dora Overton!

) Her choice of celebration is Iceland. We're spending ten days wandering between the Snaefellsnes peninsula, through Vik and Hof (and points between) and ending in Reykjavik and a night at the Blue Lagoon. I know, as Yogi Berra said, "Nobody goes there anymore, it's too crowded", but it's her trip, and I'm more than happy to share in her joys!
Cheers,
Tom