Alder MF – Roomy Summer Sleeping Bag

The Alder MF is a roomy summer sleeping bag made for mild nights, starry skies, and comfort without restriction. Its semi-rectangular shape gives you space to stretch out while still sealing in warmth when the temperature drops before dawn.

With a 62-inch shoulder girth and 46 inches at the foot, the Alder MF offers generous space for side sleepers or anyone who moves around while sleeping. It’s perfect for warm-weather backpacking, casual car camping, and minimalist weekend getaways.

This bag features 850+ fill power goose down for lightweight insulation and high-loft performance. The MicroLite XP™ shell adds wind resistance and water repellency while staying breathable and durable in summer conditions.

Two full-length zippers offer versatile use. One runs along the side, while the second wraps around the footbox. You can open the bag completely flat for use as a quilt or comforter. You can also zip it to another Alder MF or to the Summer Coupler™ to create a roomy two-person sleep system.

The Alder MF excels on warm nights where you want just enough insulation without sacrificing airflow or comfort. Whether you’re camping in the desert, relaxing at a festival, or setting up at a trailhead basecamp, this bag brings reliable comfort and flexibility.

Formerly known as the Aspen MF, nothing has changed but the name. It’s still made in the USA and crafted to Western Mountaineering’s high standards.

For warm-weather camping with space to move and options to adapt, the Alder MF is your go-to sleeping bag.

Features

Explanation

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 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 Zips together with Summer Coupler when fully opened to form a lightweight comforter Comes with ultralight stuff sack and breathable mesh storage bag 1 lb. 15 oz. Total Weight

Specifications

• US
• Metric

Shape	Semi Rec
Temp Rating	25°F
Fill	850+ Power Goose Down
Color	Royal Blue/Black
Country of Origin	USA
Fabric	20D Microfiber
Loft	5" in
Inside Girth shdr/hip/foot	6'0" 62"/59"/46" 6'6" 62"/59"/46"
Fill Weight	6'0" 16 oz 6'6" 18 oz
Total Weight	6'0" 1 lb 15 oz 6'6" 2 lb 1 oz
Stuff Size	6'0" 7"x13" XS 6'6" 7"x13" XS

Shape	Semi Rec
Temp Rating	-4°C
Fill	850+ Power Goose Down
Color	Royal Blue/Black
Country of Origin	USA
Fabric	20D Microfiber
Loft	13 cm
Inside Girth shdr/hip/foot	180cm 157/150/117 cm 200cm 157/150/117 cm
Fill Weight	180cm 455 g 200cm 510 g
Total Weight	180cm 880 g 200cm 935 g
Stuff Size	180cm 18x33 cm XS 200cm 18x33 cm XS