MegaLite – Ultralight Wide Sleeping Bag

The MegaLite is an ultralight wide sleeping bag built for backpackers who need room to move without carrying extra weight. At just 1 lb 8 oz, it delivers exceptional comfort, warmth, and packability for three-season use.

This bag features a wider mummy cut, offering more shoulder and hip space than standard ultralight bags. It’s perfect for side sleepers, restless campers, or anyone who dislikes tight quarters in the backcountry.

The MegaLite uses 850+ fill power goose down for high-loft insulation that compresses easily and lofts quickly. Full baffle construction allows the down to fully expand, maximizing warmth in cool-to-cold conditions.

A full-length #5 YKK zipper adds versatile ventilation. You can unzip the bag completely on warm nights or zip up tight when temperatures drop. An insulated draft tube prevents cold spots and seals in body heat.

The 12-denier ripstop nylon shell is lightweight, breathable, and water-resistant. It helps regulate moisture while keeping your insulation dry in damp conditions.

Use the MegaLite for thru-hikes, fastpacks, or alpine loops where nighttime lows fall near freezing. It offers a perfect balance of weight, comfort, and reliability.

Whether you’re chasing miles or just want to sleep better outdoors, this bag delivers space without compromise. It packs small, weighs little, and performs where it counts.

Proudly made in the USA, the MegaLite is Western Mountaineering’s answer for backpackers who want ultralight performance and unmatched comfort in one high-performing 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 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

Specifications

• US
• Metric

Shape	Mummy (w/ top collar)
Temp Rating	30°F
Fill	850+ Power Goose Down
Color	Navy Blue/Black
Country of Origin	USA
Fabric	12D ripstop nylon
Loft	4" 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" 11 oz 6'0" 12 oz 6'6" 13 oz
Total Weight	5'6" 1 lb 7 oz 6'0" 1 lb 8 oz 6'6" 1 lb 9 oz
Stuff Size	5'6" 6"x12" XXS 6'0" 7"x13" XS 6'6" 7"x13" XS

Shape	Mummy (w/ top collar)
Temp Rating	-2°C
Fill	850+ Power Goose Down
Color	Navy Blue/Black
Country of Origin	USA
Fabric	12D ripstop nylon
Loft	10 cm
Inside Girth shdr/hip/foot	165cm 160/142/99 cm 180cm 163/142/99 cm 200cm 165/142/99 cm
Fill Weight	165cm 310 g 180cm 340 g 200cm 370 g
Total Weight	165cm 650 g 180cm 680 g 200cm 710 g
Stuff Size	165cm 15x30 cm XXS 180cm 18x33 cm XS 200cm 18x33 cm XS