I can see the camera gear being an issue. I used to be a camera guy (years back in the film days
). I now have only the mobile phone, but I periodically take some great pictures with that (and I take very few at all) and think that I'd like to do the camera thing again. That could well make a difference
As to all the computer stuff, the most I will bring when I travel is my work laptop (I'm one of those who doesn't fully disconnect from wok when on vacation and I actually like it that way), but I would never bring any of the rest of that stuff as I'd not need it.
On most trips, since I wear a size 12, my running shoes take up a good part of my luggage. Without that. I could use an even smaller bag. But I just know that I will, and will not, actually need and go with that.
Cheers.