What is the best sleeping bag for the Pacific Crest Trail?

The best sleeping bag for long-distance hiking the Pacific Crest Trail should be a Down sleeping bag (rather than synthetic) to reduce backpack weight and size. The sleeping bag on average should be rated for 20⁰ F (-6.7⁰ C) degrees to handle most weather conditions (cold-weather/all-weather), so you don't get too cold. Here are some of the most popular sleeping bags for long-distance hiking of the PCT:

• Western Mountaineering UltraLite Sleeping Bag: 20 Degree Down, 850+ fill down, (regular) 1 lb 13 oz
• Feathered Friends Nano 20 Sleeping Bag: 20 Degree Down, 900+ Goose Down, (regular) 1 lb 12 oz
• Marmot Helium Down Sleeping Bag: 15 Degree Down, 800 fill down, (regular) 2 lbs 1 oz
• Kelty Cosmic 20 Degree Sleeping Bag: 20 Degree Down, 600 Fill Power DriDown, 2 lb 9 oz

Make sure you also have a good sleeping pad for the PCT. One of the most popular foam pads is the Therm-a-Rest Z Lite Sol Mattress or the most popular inflatable pad is the Thermarest NeoAir X-Lite.