Outdoor Living & Camping / Guide
Sleeping Bag Temperature Ratings: How to Use Comfort and Limit
Use standardized comfort and limit ratings, your expected overnight weather and your sleeping pad to choose a camping bag.
Find out whether the bag publishes standardized comfort and limit figures or its own temperature estimate. The comfort rating is generally the more conservative starting point. Compare like ratings across bags, especially when one seller highlights a limit figure and another highlights comfort.
Use the coldest conditions you realistically expect
Check the forecast for the campsite elevation and plan for changes. If you sleep cold, choose margin. The REI guide to sleeping bag ratings explains the standardized figures and why real conditions can differ from the test. Avoid treating an extreme rating as a target for a comfortable night.
Compare the whole sleep setup
Account for your pad, clothing, shelter and expected moisture. Check pad insulation separately and use the gear together. Fit matters as well. A bag that is too short can compress insulation around your feet, while extra interior space can change how the bag feels.
Test the combination before a longer trip
Try the pad and bag together in a low-consequence setting where you can change your setup if you get cold. Check whether the bag packs alongside the rest of your kit. Make your next decision from the conditions you experienced and the conditions you expect.
