From the manufacturer

The Antelope MF is a lightweight alpine sleeping bag built for three season mountaineering and high-altitude backcountry objectives. At just 2 lbs 7 oz, it delivers dependable warmth without weighing you down.

This bag excels in rugged conditions. The MicroLite XP™ shell provides water resistance and durability. It shields the 850+ fill power goose down from condensation and spindrift while remaining breathable.

A full down-filled draft collar and insulated draft tube lock in heat. The efficient mummy shape improves thermal retention without adding bulk. Whether you’re camped on a wind-blasted ridge or inside a snow-lined bivy, the Antelope MF helps you stay warm and sleep well.

Designed for climbers, alpinists, and backpackers, this bag balances performance and packability. It fits easily into your alpine kit and holds up through long miles and variable mountain weather.

The Antelope MF is rated for colder nights in the mountains. It’s ideal for shoulder-season trips or elevations where frost is common. If you’re venturing into exposed terrain, this is the bag that helps you rest and recover with confidence.

Use it for glacier approaches, Sierra traverses, or extended alpine routes where weight, warmth, and reliability matter. The materials, cut, and construction are all optimized for real-world mountain conditions.

Proudly made in the USA, the Antelope MF is part of Western Mountaineering’s trusted legacy of high-performance backcountry sleep systems. It’s a bag you’ll reach for when your next summit push calls for lightweight warmth and weather protection.

Features

• Filled with 850+ Fill Power, ethically-sourced, premium goose down
• Continuous baffles allow you to shift down for more insulation in colder weather
• Full-length #5 YKK zipper provides a smooth, easy unzipping experience while saving weight
• Insulated Draft Tube blocks cold air and keeps the torso better insulated
• Durable 20 denier MicroLite XP™ outer shell stays more breathable and water resistant longer than traditional polyesters
• Fully insulated draft collar seals in inner heat without adding much weight
• Comes with ultralight stuff sack and breathable mesh storage bag

Specifications & Sizing

• Temperature Rating: 5°F
• Fill: 850+ Power Goose Down
• Fabric: 20d nylon microfiber