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ALPS Mountaineering Fusion 40degF Mummy-style Sleeping Bag
Our editorial team reviews specifications, product data, and field-use information to keep pages accurate.
$139.99
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SKU: WX2*0715191
Overview
Built for campers who want more room to move without giving up a mummy-style shape, this sleeping bag uses a zipperless top that opens up for a less confined feel. The quilted upper layer can be flipped open when conditions are warmer or tucked in and secured with the toggle system when extra coverage is needed, while the drawcord hood helps reduce drafty air. RDS-certified hydrophobic down with 600 fill power is used on top, paired with TechLoft Micro insulation on the bottom, and the 82-inch length is sized to accommodate most people. A compression stuff sack is included for packing and transport.
Why Hunters Choose the Alps
Zipperless Design
Feels less confining and makes
Quilted Top
Can be opened for ventilation
Toggle System
Lets you secure the top
Rds-certified Hydrophobic
600 fill power on top
Techloft Micro
Bottom insulation is lightweight and
Key Features
- Zipperless design feels less confining than a traditional sleeping bag.
- Quilted down top can be flipped open for added ventilation.
- Top layer can be tucked in and secured with the toggle system for more warmth.
- RDS-certified hydrophobic down insulation with 600 fill power on top.
- TechLoft Micro insulation on the bottom uses a siliconized finish.
- Drawcord hood adjustment helps keep out drafty air.
- Includes a compression stuff sack for storage and transport.
Best Used For
- Warm-weather hunters needing a 40-degree bag with adjustable top coverage
- Campers who prefer easier entry and exit than a traditional zipper bag
- Users wanting a less confining sleep system for base camp or truck camping
- Hunters packing compact gear and valuing the included compression stuff sack
- Outdoor users who want draft control with a drawcord hood adjustment
Specifications
| Bottom Insulation | TechLoft Micro insulation |
|---|---|
| Bottom Insulation Finish | Siliconized finish |
| Closure System | Toggle system |
| Exterior Fabric | 380T 20D nylon |
| Hood Adjustment | Drawcord hood adjustment |
| Included Accessories | Compression stuff sack |
| Length | 82 inches |
| Lining Fabric | 380T 20D nylon |
| Style | Mummy-style Sleeping Bag |
| Temperature Rating | 40degF |
| Top Attachment | Unattached on 3 sides |
| Top Fill Power | 600 fill power |
| Top Insulation | RDS-certified hydrophobic down insulation |
| Top Quilt | Quilted down top |
| Zipper | Zipperless |
Pros
- Zipperless design feels less confining and makes entry and exit easier.
- Quilted top can be opened for ventilation when conditions warm up.
- Toggle system lets you secure the top for added warmth.
- RDS-certified hydrophobic down insulation with 600 fill power on top.
- TechLoft Micro bottom insulation is lightweight and compact.
- Drawcord hood adjustment helps keep out drafty air.
Considerations & Trade-offs
- The 40°F rating makes this a warmer-weather bag rather than a cold-season option, so it’s best matched to mild nights and shoulder-season use.
- The zipperless top is less confining, but it also means the bag uses a different closure system than a traditional mummy bag, which may take some getting used to.
- The top is unattached on three sides for flexibility, but that design can feel less sealed-in than a fully enclosed bag when you want maximum coverage.
- The included compression stuff sack helps with packing, but the bag’s mixed insulation and quilted top design may still require a bit more attention when stowing than a simpler sleeping bag.
Suggested Comparisons
- Mummy-style sleeping bags
- Quilt-style sleeping bags
- Three-season sleeping bags
- Backpacking sleeping bags
Suggested Accessories
- Sleeping pad
- Compression stuff sack
- Tent footprint
- Camp pillow
Frequently Asked Questions
What makes the Fusion 40degF Sleeping Bag different from a standard mummy bag?
It uses a zipperless design, and the top quilt is unattached on 3 sides so it can fold open for more freedom. It can also be tucked in and secured with a toggle system.
Can the top be adjusted for warmer or cooler conditions?
Yes. If you want less coverage, you can flip open the quilted down top. If you want more warmth, you can tuck the quilted down layer in and secure it closed with the toggle system.
What insulation is used in this sleeping bag?
The top quilt uses RDS-certified hydrophobic down insulation with 600 fill power. The bottom uses TechLoft Micro insulation with a siliconized finish.
Does it have a hood or draft control?
Yes. It includes a drawcord hood adjustment to help keep out drafty air.
What comes with the sleeping bag?
It includes a compression stuff sack.