Sinar rails are infinitely extendable. A standard camera comes with a 12" 'base' (30 cm) rail, and that can be added to with extensions that come in 6", 12" and 18" lengths.
I tend to backpack with the camera compressed down onto a 6" extension rail, and carry the 12" base rail in my pack. The 6" allows me to use my 90 mm and 150 mm lenses, and I add the extension if I want to do close ups or when I want to use my 240 mm and 465 mm lenses. I have an 18" rail too, but leave it at home as I would only need it for close-ups with the 465 mm lens and those are rare indeed.
Everything I need to use the camera with one lens, including the base rail, dark cloth, meter, toolkit, loupe, film, LEE filter kit and lensshade, and a bag bellows fits into a Samsonite shoulder bag. That gets dropped into the top of my rucksack. Underneath goes a padded bag with the other lenses, and I sometimes have another padded bag with a Sinar shutter and other lensboard-sized accessories in it. Tripod goes on the ski-straps at the side of the pack, with head and rail-clamp attached.
It would all fit in an 'alpine' day pack of 45-50 liters, but the one I have is deeply waisted and the Samsonite won't quite fit. I like having it so I can dump the main pack and go boulder hopping with a complete camera outfit, so I just use my bigger 80 liter pack. I have never weighed it, but even with water, foul weather clothes and lunch I don't feel like I'm backpacking.
I have experimented with various forms of packing, and the length of the rail tended to dictate everything else. A extendable or folding rail helps a lot. I tried the standards-parallel-to-the-rail trick, but it doesn't really work on a Norma, and in any case, the resulting package is much more delicate and extended than my compact brick. YMMV of course.