When it comes to premium sleeping bags, Western Mountaineering sets the industry standard—and the MegaLite is a testament to that legacy. Designed for adventurers who refuse to compromise on warmth, weight, or comfort, this market-leading ultralight down sleeping bag is engineered to deliver top-tier performance in any backcountry setting.
With 850+ fill power goose down, the MegaLite offers unrivaled loft and warmth-to-weight efficiency, ensuring maximum insulation without unnecessary bulk. The spacious yet ultralight mummy design provides extra room to move, making it ideal for side sleepers or those who value unrestricted comfort. Its fully baffled construction optimizes heat retention, while the full-length YKK zipper allows precise temperature regulation.
Crafted with premium 12-denier ripstop nylon, this bag balances breathability, durability, and moisture resistance, ensuring you stay warm and dry in changing conditions. At just 1 lb 8 oz, the MegaLite is the gold standard for lightweight, high-performance sleeping bags, making it the ultimate choice for backpackers, mountaineers, and outdoor enthusiasts seeking the best in class.
When you choose Western Mountaineering, you're investing in elite craftsmanship, cutting-edge materials, and decades of expertise—because when the night gets cold, you deserve the very best.
The Brand
More than 40 years ago, two northern California mountaineers came together with a vision of uncompromised excellence. Their inspired dedication and persistence built the foundation of this now globally renowned brand. Western Mountaineering's history is more than just two young men building sleeping bags: even today WM still remains a small independent company, making all of its sleeping bags in the original factory in San Jose (USA), whilst constantly striving to give their customers the finest down products money can buy.
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
- Breathable 12 denier ripstop nylon outer shell makes bag ultralight yet durable
- Top draft collar with adjustable draw closure saves weight while keeping cold air from entering the sleeping bag
- Comes with ultralight stuff sack and breathable mesh storage bag
- 1 lb. 8 oz. Total Weight
More Help? For further assistance on choosing your down sleeping bag, please view the various help videos available under the 'Videos' tab above. We also have an article explaining fill power, the pros and cons of down over synthetic insulation and more info on caring for your bag available to view here: A Guide to Down Sleeping Bags.
Specifications
- Shape: Mummy (w/top collar)
- Compressed Size: 18x33 cm
- Outer Fabric: 12D ripstop nylon
- Zip: Left
- Length: 180cm (6ft)
- Comfort Limit: -2°C
- Manufacturer: Western Mountaineering
- Fill Power: 850+US Power Goose Down
- Weight: 680g
- Fill Weight: 340g
- Loft: 10cm
- Inside Girth: 163cm (shoulder) / 142cm (Hip) / 99cm (foot)
- Colour: Navy Blue/Black
