I had looked at the Kilo bag
EN rating (F): 37 | 28 | 0
weight: 34 oz.
pack size: 7X11
I'm probably splitting hairs but as I mentioned 25F is the absolute lowest I'd expect to encounter and thus set it as my cut-off.
The Kilo is a 30F bag and not comparable to the 25F Orion based on size and weight alone. If 30F was my cutoff I'd pay $30 over the Kilo price and get a Montbell UL Spiral Down Hugger #3 which weighs a pound less.
I'm probably being blasphemous but I was actually comparing the Orion to the Montbell SS.Down Hugger #2 (25F). I don't have the EN rating for the bag but I have read that the temp is accurate. The MB weighs 1 ounce less the Orion and packs to the same size. Not withstanding that the bag is roomier because of the stretch material and is down (which I would actually prefer), it is $80 more expensive than the Orion. What do I get for the $80 differential? Could the bag be compressed down more than what is stated on their site? How much more do you think?
Maybe the question should be what are competitive bags that have an effective temp rating of 25 or less for under $250? I'm willing to go below 25F but not above.