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Some Western Mountaineering items must be custom ordered once an online order has been placed. Typically we will be able to ship your item to you within 3-4 weeks. If the item is in stock it will ship immediately.

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Bristlecone MF – Expedition Sleeping Bag for Extreme Cold

The Bristlecone MF is an expedition sleeping bag for extreme cold, designed for deep-winter comfort in the harshest environments. This bag is built for Arctic expeditions, high-altitude base camps, and late-season hunts where staying warm is mission-critical.

Its wide, semi-rectangular shape provides extra space to layer up, shift positions, or simply stretch out. You won’t sacrifice insulation for comfort. With 850+ fill power goose down and massive loft, the Bristlecone offers serious heat retention in sub-zero conditions.

The MicroLite XP™ shell resists water and wind while remaining breathable. It sheds frost and spindrift while protecting the insulation inside. A full down-filled collar and insulated draft tube seal in warmth and block out the cold.

This bag thrives in bitter cold. Whether you’re camped in a snow cave or on a wind-swept ridgeline, the Bristlecone MF offers trusted warmth and durability. Its roomy cut makes it perfect for long base camp stays or anytime you want to sleep in full layers.

At 4lbs 3 oz, it’s surprisingly light for a bag with this much insulation and space. It packs efficiently for its size, making it ideal for cold, gear-heavy expeditions.

Handmade in the USA, the Bristlecone MF combines expedition-ready performance with unmatched sleeping comfort. When the temperature drops and the weather turns unforgiving, this is the bag you’ll want to be in.

Features:

• Filled with 850+ Fill Power ethically-sourced premium goose down
• Side block baffle construction for better control of insulation in colder weather
• Full-length #5 YKK zipper provides a smooth, easy unzipping experience while saving weight
• Insulated Draft Tube and Full Collar keep the cold air out and warm air inside to prevent heat loss
  
• Durable 20 denier MicroLite XP™ outer shell stays more breathable and water resistant longer than traditional polyesters
• Dual zipper design allows sleeping bag to open completely for greater temperature regulation
• Comes with ultralight stuff sack and breathable storage bag
• 3lbs. 15 oz. Total Weight

Specs:

• Shape: Semi Rectangle w/ full collar
• Fabric: 20D Microfiber
• Loft: 8.5"
• See photos for spec chart

Please note: The Great Divide Trail discount does not apply to this item.