Nope not sure if I need a 15.
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Here’s how I decide what bag to bring:
- Look at the historical weather data for the nearest town to your hunt area. The town should be very close to your hunt area in latitude.
- Look at the low temp and elevation for that town.
- Look at your hunt area and decide what the highest elevation you are likely to camp at.
- On average the temperature difference is -3.5°F per 1,000’ elevation gain.
- Calculate the expected temperature (round down to the nearest 5°).
- I do that then bring a bag rated to about 10° warmer than expected temps.
In other words if the calculated low is 20° I bring my 30° bag as I sleep warm and can always wear my beanie and my insulation layer if I feel a little chilly.
I have four sleeping bags to choose from. I always bring a warmer one to leave in the truck. Then I can swap or if necessary sleep in the truck without unpacking.
I can’t remember if you are going to keep the Klymit bag. I would keep it and buy a 30° bag. Then you have a small quiver to choose from and can leave one in the truck. Any 15° bag is going to be a little heavy/bulky unless you spend big bucks on 850 fill or better down.