I would caution with using the Helag and Anjan with just the fly except in favorable conditions. I can pretty much guarantee it will get wet inside with wind and snow/rain. The fly doesn't hit the ground! I usually bring super light painter's plastic to keep dirt and water off my gear even with my Nallo GT fly.
If you are using just the fly in Alaska or other areas with wind, snow, rain, and cold I would definitely consider flies that reach the ground. The inner tent bodies have tub floors and you can also buy footprints to add to water/weather proofness.
You will need additional clothes and protection if you use a fly that doesn't hit the ground in extreme weather.....speaking from experience! If most of your time is in mild and dry weather I would have no worries with a higher fly that doesn't touch the ground.
Obviously, weight is important but it's silly not to be prepared for the worse conditions on remote, extended trips! I've spent weeks in the backcountry in Alaska, Wyoming, and Colorado. It can get mighty spooky and miserable being miles from the nearest road. Wind and moisture can really cause problems in those circumstances! To me, I'd rather skimp on 1 or 2 lbs somewhere else than my home away from home in horrible conditions!
