Best Sleeping Bags for High Altitude Trekking

A high-altitude sleeping bag is the single most important piece of gear for Nepal trekking. At 5,000 m, temperatures drop to −15 °C at night, and a cheap sleeping bag can mean the difference between a restful sleep and a miserable, potentially dangerous night. Here is the complete 2025 guide to the best sleeping bags for high-altitude trekking.

Sleeping Bag Temperature Ratings — What You Need

Sleeping bags have three temperature ratings:

• Comfort rating — the temperature at which a cold sleeper (typically a woman) can sleep comfortably
• Lower limit — the temperature at which a warm sleeper (typically a man) can sleep curled up
• Extreme rating — the temperature at which you can survive (but not sleep) for 6 hours

Trek	Min Night Temperature	Required Comfort Rating
Poon Hill, Helambu	−5 °C	0 °C comfort
Annapurna Base Camp	−10 °C	−5 °C comfort
Annapurna Circuit, EBC, Manaslu	−15 °C	−10 °C comfort
Three Passes, Kanchenjunga BC	−20 °C	−15 °C comfort
Upper Dolpo, Dhaulagiri Circuit	−25 °C	−20 °C comfort

Top 5 Sleeping Bags for High Altitude Trekking

1. Western Mountaineering UltraLite — Best Overall

850-fill down, comfort rating −7 °C. Weight: 820g. Price: $630. Best for: serious trekkers wanting the best. Pros: ultralight, warm, durable, compressible. Cons: expensive.

2. Therm-a-Rest Hyperion 32 — Best Value Down

900-fill down, comfort rating 0 °C. Weight: 600g. Price: $380. Best for: ultralight trekkers. Pros: very light, packs small, good value. Cons: less warm than Western Mountaineering.

3. Mountain Hardwear Bishop Pass 0 — Best for EBC

650-fill down, comfort rating −18 °C. Weight: 1,400g. Price: $290. Best for: EBC, Annapurna Circuit. Pros: warm, comfortable, durable. Cons: heavier than ultralight options.

4. Nemo Disco 15 — Best Side Sleeper

650-fill down, comfort rating −9 °C. Weight: 1,090g. Price: $260. Best for: side sleepers. Pros: roomy 'spoon' shape, comfortable. Cons: heavier than mummy bags.

5. Coleman Sunridge 0 — Best Budget

Synthetic, comfort rating −18 °C. Weight: 1,800g. Price: $50. Best for: budget trekkers. Pros: cheap, warm. Cons: heavy, bulky, synthetic.

Sleeping Bag Comparison Table

Sleeping Bag	Insulation	Comfort Rating	Weight	Price	Best For
Western Mountaineering UltraLite	850-fill down	−7 °C	820g	$630	Ultralight premium
Therm-a-Rest Hyperion 32	900-fill down	0 °C	600g	$380	Value down
Mountain Hardwear Bishop Pass 0	650-fill down	−18 °C	1,400g	$290	EBC, Annapurna
Nemo Disco 15	650-fill down	−9 °C	1,090g	$260	Side sleepers
Coleman Sunridge 0	Synthetic	−18 °C	1,800g	$50	Budget

Down vs Synthetic Insulation

Down

• Pros: Warmer for weight, more compressible, longer-lasting (15+ years)
• Cons: Useless when wet, more expensive, slower to dry

Synthetic

• Pros: Warm when wet, cheaper, faster drying
• Cons: Heavier, bulkier, shorter lifespan (5–7 years)

Sleeping Bag Features to Look For

• Fill power — 600+ is good, 800+ is premium. Higher fill power = warmer for less weight.
• Mummy shape — most efficient warmth-to-weight ratio
• Draft tube behind zipper — prevents cold spots
• Draft collar — seals in warmth at the neck
• Two-way zipper — for ventilation
• Hood with drawcord — keeps head warm
• Compression sack — for packing small
• DWR treatment — water-repellent outer shell

Sleeping Bag Liners — Extend the Range

A sleeping bag liner adds 5–10 °C of warmth:

• Silk liner — adds 5 °C, weighs 150g, $50. Most popular.
• Fleece liner — adds 10 °C, weighs 400g, $40. Warmest.
• Cotton liner — adds 3 °C, weighs 300g, $20. Cheapest.
• Thermal reflective liner — adds 8 °C, weighs 200g, $60. Best warmth-to-weight.

Renting vs Buying a Sleeping Bag in Nepal

Renting in Kathmandu: $1.50/day, $20 deposit. Quality varies — some shops have decent down bags, others have cheap synthetic. Useful for one-time trekkers, but quality-conscious trekkers should bring their own.

Sleeping Bag Care

• Store uncompressed in a cotton storage sack (not the compression sack)
• Air out after each trip
• Wash rarely — only when truly dirty, use special down soap (Nikwax Down Wash)
• Dry clean NEVER
• Use a liner to keep the bag clean
• Patch small holes with repair tape (Gear Aid Tenacious Tape)

Tips for Sleeping Warm at Altitude

1. Use a sleeping pad with high R-value (4+ for winter, 3+ for cold weather)
2. Wear thermal base layers to bed
3. Wear a beanie to bed (you lose 30% of body heat through your head)
4. Fill a water bottle with hot water and put it in your sleeping bag
5. Eat a high-calorie snack before bed (your body burns calories to stay warm)
6. Use the tea house stove to warm your bag before bed
7. Don't sleep with wet clothes in the bag (they make the bag damp)

A quality sleeping bag is essential for Nepal trekking. Get a 650+ fill down bag rated to −15 °C comfort, learn to use it properly with a liner and a good sleeping pad, and you'll sleep warm even at 5,000 m. For more gear guides, see our best trekking poles guide and our layering guide for cold mountain weather.