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Sleeping bag rating clarification:
The Susitna 100 requirement for a sleeping bag is:
A one piece sleeping bag (no combination of liners) rated to -20 degrees Fahrenheit (20 degrees below 0 degrees Fahrenheit, =28.8 degrees below 0 degrees Celsius). Many sleeping bags now are rated by the EN 13537 testing standard.
To use this rating system to meet the Susitna 100 requirement, look at the lowest limit of comfort (this is the number near the middle of the colored temperature bar). Please note, it is NOT the T extreme.
Check out the lists on the 1049 Mile Award page