Caribou MF – Lightweight Summer Backpacking Sleeping Bag

The Caribou MF is a lightweight summer backpacking sleeping bag built for long-distance hikes, warm nights, and unpredictable weather. Weighing just 1 lb 5 oz, it offers breathable protection without adding bulk.

This bag uses MicroLite XP™ fabric to block wind and resist moisture. The shell is highly breathable and surprisingly durable for its weight. It keeps condensation out while allowing heat and humidity to escape.

Inside, 850+ fill power goose down provides excellent warmth-to-weight efficiency. The down lofts easily and compresses small—perfect for ultralight packs and summer trail use.

A roomy mummy cut allows for comfort without unnecessary material. It gives you space to move without letting warmth escape. The full-length #5 YKK zipper allows for easy venting or full open use in warmer conditions.

The Caribou MF shines on long trails like the PCT or Appalachian Trail. It’s ideal for high-mileage summer days, hut trips, or alpine loops where nighttime temperatures stay mild but weather can shift quickly.

Use it as a standalone bag for warm-weather trips or pair it with a bivy or liner for extended versatility. Its packability and durability make it a reliable choice for minimalist adventurers who go far with less.

Made in the USA, the Caribou MF combines Western Mountaineering’s legendary craftsmanship with modern ultralight performance. It’s a true warm-season workhorse built for backpackers who sleep light but travel far.

Features

Explanation

Filled with 850+ Fill Power ethically-sourced premium goose down Sewn-through horizontal seams and baffled vertical seams keep bag ultralight while providing full down coverage Full-length #5 YKK zipper provides a smooth, easy unzipping experience while saving weight Durable 20 denier MicroLite XP™ outer shell stays more breathable and water resistant longer than traditional polyesters Wide cut mummy bag gives more internal space for side sleeping while protecting against cold Comes with ultralight stuff sack and breathable mesh storage bag 1 lb. 5 oz. Total Weight

Specifications

• US
• Metric

Shape	Mummy (box stitched)
Temp Rating	35°F
Fill	850+ Power Goose Down
Color	Navy Blue/Black
Country of Origin	USA
Fabric	20D Microfiber
Loft	3.5" in
Inside Girth shdr/hip/foot	5'6" 63"/56"/39" 6'0" 64"/56"/39" 6'6" 65"/56"/39"
Fill Weight	5'6" 9 oz 6'0" 10 oz 6'6" 11 oz
Total Weight	5'6" 1 lb 4 oz 6'0" 1 lb 5 oz 6'6" 1 lb 7 oz
Stuff Size	5'6" 6"x12" XXS 6'0" 6"x12" XXS 6'6" 6"x12" XXS

Shape	Mummy (box stitched)
Temp Rating	2°C
Fill	850+ Power Goose Down
Color	Navy Blue/Black
Country of Origin	USA
Fabric	20D Microfiber
Loft	9 cm
Inside Girth shdr/hip/foot	165cm 160/142/99 cm 180cm 163/142/99 cm 200cm 165/142/99 cm
Fill Weight	165cm 255 g 180cm 285 g 200cm 310 g
Total Weight	165cm 565 g 180cm 595 g 200cm 650 g
Stuff Size	165cm 15x30 cm XXS 180cm 15x30 cm XXS 200cm 15x30 cm XXS