Space to Move. Lightweight Performance.

The Western Mountaineering MegaLite is designed for climbers and backpackers who want ultralight performance with extra room to move.

With a generous 64" shoulder girth and 850+ fill power goose down, it delivers reliable warmth down to -2°C, making it perfect for summer and mild 3-season use.

Despite its roomy fit, the MegaLite remains impressively light at ~680g, offering the ideal balance of comfort, packability, and performance.

Why You'll Love It

Wide fit - More space, less restriction
Ultralight - From ~650g
Warm to -2°C - Ideal for summer & mild 3-season
850+ fill power down - Premium insulation
Highly packable - Easy to carry

Built for Lightweight Comfort

Perfect for:

Summer backpacking
Bikepacking trips
Thru-hiking
Warm-weather alpine use
Comfort-focused adventures

Designed for those who want space without extra weight

Performance Features

Mild 3-Season Warmth (-2°C)

Reliable performance

Keeps you:

Comfortable in summer conditions
Prepared for cooler nights
Flexible across climates

850+ Fill Power Goose Down

Premium insulation

Provides:

Excellent warmth-to-weight ratio
High compressibility
Long-lasting loft

Continuous Baffle System

Adjustable insulation

Allows:

Shifting down for colder nights
Balancing warmth in milder temps
Greater versatility

Insulated Draft Tube + Top Collar

Efficient heat retention

Helps:

Block cold air
Maintain warmth
Reduce heat loss

ExtremeLite™ Shell (12D)

Ultralight and breathable

Benefits:

Minimal weight
Compact packing
Durability for its class

Wide Mummy Fit

Comfort-focused design

Provides:

More shoulder and hip space
Freedom of movement
Less restrictive sleep

Technical Specifications

Temperature Rating: -2°C
Fill: 850+ Fill Power Goose Down
Loft: 10 cm (4")
Shell Fabric: 12D ripstop nylon (ExtremeLite™)

Weights:
165cm: 650g
180cm: 680g
200cm: 710g

Fill Weights:
165cm: 310g
180cm: 340g
200cm: 370g

Girth (Shoulder/Hip/Foot):
165cm: 160 / 142 / 99 cm
180cm: 163 / 142 / 99 cm
200cm: 165 / 142 / 99 cm

Packed Size:
165cm: 15 x 30 cm
180cm+: 18 x 33 cm

Origin: USA

Includes:
Ultralight stuff sack
Breathable mesh storage bag

Perfect For

Backpackers
Bikepackers
Thru-hikers
Comfort-focused users
Summer adventurers