I've never had much of a problem with dust, loading DD holders in the film-loading rooms at school.
they have compressed air hoses in the darkrooms, so being able to load the sheet of film into the holder, then give it a puff or two of air(filtered of course), then quickly(well, carefully), slide the 1/2 opened darkslide in completely. I've got it down to about 5s a side.
after each use, I blow out the holders with compressed air, gets em nice and clean before loading. same with the darkslides, give em a good blasting.
works for me. now, I get a speck or two of dust here and there sometimes, but generally I'm getting 98-99% dust free film. besides, when I sc@n the film, I look over the whole thing at 100% in PS anyway, so I can just spot/clone it out there
-Dan
<edit> I have a QL holder as well, but I'm sorry that I bought it. I only put 2 boxes of QL astia and acros through it each. what a waste of money. I got it used, but it's still $60 down the drain :mad
I'm not much of a backpacker to be honest, but to me, if I were to be going out on an extended hike, or long walks with LF gear, I'd just jury-rig my little bro's big-wheel wagon(inflatable tires), and that can roll pretty much over anything.