Nunatak Arc Alpinist Sleeping Bag -7C and beyond

[Colin Thomas]

I am going to buy this bag from Nunatak for 4 season use in southwestern BC

http://www.nunatakusa.com/Sleeping_Bag_Arc_Alpinist_Sleeping_Bag.htm

You can read more info about the bag here http://www.nunatakusa.com/arc_faq.htm

I am going to get it with the Pertex Quantum shell (orange or green????). Should I get the 2ounce down overstuff option to be sure I get maximum loft and long term loft out of this sucker? Also should I have it made with a differentially cut foot box? I will ask Nunatak these questions too but would like your opinions.

I am thinking that this bag would be great for all seasons. I the summer use it as a quilt, spring and fall layer my additional clothing under it and in the winter I would layer it with a belay jacket and pants (down or synthetic) which I would be carrying anyways to deal with cold weather around camp.

On a bag like this how far do you think I could extend the temp rating? If you had it what would you where to bed with it in the winter.

For winter layering I am looking at these too.

http://www.nunatakusa.com/down_sweater_skaha_hoodie.html

http://www.nunatakusa.com/down_kobuk_knickers.htm

http://www.nunatakusa.com/Down_Booties_Teanaway_Slipper.htm

With a set up like this what do you think would be my temp limit?

Any help would be nice. Thanks in advance.

[Kevin Sawchuk]

I have two custom bags from Nunatak. I have a 13 oz bag I have pushed to -3C with just a few warm clothes and a good pile hat (very small bag modeled on their Arc Ghost with a small foot bag and in .85 ripstop) AND a 22oz bag in Epic like the Arc Alpinist BUT with a very narrow foot, and sewn into a typical bag for about 20″. Both bags have excellent workmanship and have met my needs. Just used the latter this weekend on a snow camping trip but didn’t get to test it well as the temperatures dropped only to -7C. Didn’t need the down balaclava. I don’t think you’d have any problem getting that bag down to -10C. You might want to have Tom sew the foot sack a little narrower and higher (to the knee level or so) for heating effeciency. I would get a diffeerential cut in a bag designed for this temperature and below.

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