We’ve read the reviews across the web for the The North Face Furnace Sleeping Bag: 20 Degree Down and summarize the results below:
Universal Ranking
PeakScore: 87 (out of 100)
User Rating: 4.6 stars 
Expert Rating: 3.8 stars 
Number of Ratings Reviewed: 47
Pros & Cons
Reasons to buy:
User Reviews
- Very warm.
- Lots of room in the shoulders and hips.
- A good price for a sleeping bag.
- Very comfy.
- Opposite-handed sleeping bags can be zipped together.
Expert Reviews
- Has a good draft collar that does a good job keeping heat in.
- The rectangular shape increases comfort for larger people and active sleepers.
- The hood and footbox are both spacious and comfortable.
- The cinch cords for the hood are easy to use.
- Warm enough for use all summer and into the shoulder seasons.
- The treated down resists water well.
Reasons NOT to buy:
User Reviews
- The zipper catches easily on the bag and breaks easily.
- A bit heavy for backpacking.
- Velcro at the top can scratch at the face.
Expert Reviews
- Very bulky, which can make it difficult to pack for backpacking trips.
- The draft stopper could be improved by having a pull cord to tighten it.
- The hood can be bulky and uncomfortable.
Summary:
The North Face Furnace Sleeping Bag: 20 Degree Down is a warm and spacious sleeping bag that works best for car camping and short hikes. While the bag offers enough warmth to hold up in the backcountry, it does not compress well and also weighs more than many other bags, making it inconvenient to carry. The bag does stay very warm and also resists water well, but the weakest point is the zipper, which catches and breaks easily. For the price, this is a good sleeping bag for anyone looking for warmth but not picky about weight.
Multimedia:
Note: User and expert rankings were reviewed across the web. Some expert reviews include these: 1, 2, 3.