Western Mountaineering MonoLite Sleeping Bag - Minimalist to 3°C

The Western Mountaineering MonoLite sleeping bag is minimalist performance: nothing extra, everything you need. Micro-baffled 850+ fill power down and an ultralight 10D shell give reliable warmth to 3°C from around 370g, and it packs down to the size of a Nalgene bottle.

Built for fast and light missions, it strips away excess weight but keeps the features that matter: an insulated collar and draft tube to seal in warmth, and a half-length #3 YKK zip for ventilation control with minimal bulk. Micro-baffled construction improves down distribution and thermal efficiency and eliminates cold spots. The 10D nylon shell uses a PFC-free DWR for breathability and water resistance with less environmental impact. Choose the MonoLite for summer use, warm climates and layered sleep systems when you count every gram, from bikepacking set-ups to adventure racing.

Why you'll love it

• Ultra-minimal design – no unnecessary features
• Extremely lightweight – from around 370g
• Packs tiny – around 12.5 x 25.5cm, bottle-sized
• 850+ fill power goose down – micro-baffled for thermal efficiency
• PFC-free DWR shell – 10D nylon, breathable and water-resistant

Good to know

• Temperature rating: 3°C; loft 9.5cm (3.75")
• Weights: 180cm 370g; 200cm 400g
• Fill weights: 180cm 192g; 200cm 214g
• Girth (shoulder / hip / foot): 180cm 150 / 129 / 99cm; 200cm 150 / 132 / 99cm
• Zip: half-length #3 YKK
• Sizes in this listing: 6'0" (180cm), 6'6" (200cm); colour Green
• Includes an ultralight stuff sack and a breathable mesh storage bag
• Made in the USA

Who it's for

Ultralight backpackers, fastpackers, bikepackers, climbers and adventure racers at any level who want the lightest, smallest-packing summer bag.