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The world's lightest full-size down sleeping bag with 1000+ fill power RDS goose down. The Mont Zero Ultralight Sleeping Bag weighs only 10.4oz. and packs to a size of a 33.8 fl.oz. (1L) bottle.
Mont Adventure Equipment says:
Maximise your backpack space & minimise your carried weight with the Zero UL Sleeping Bag. Perfect for spring and summer bike packing, ultralight hiking in warmer climates or as a liner for your existing sleeping bag.
The Mont Zero UL Sleeping Bag weighs only 10.4oz, packs to a size no more than a 33.8 fl.oz. (1L) bottle and accommodates a user up to 6’ 7" (200cm) tall (XL).
The Zero UL Sleeping Bag uses the World's lightest downproof Nylon: Anti-Gravity Nylon. Superfine threads of only 7 denier are woven at over 520 threads per square inch producing an incredibly light, super smooth downproof fabric: Anti-Gravity Nylon weighs only, approximately, 21grams per square metre!
Anti-Gravity Nylon is extremely light but also sufficiently durable thanks to its super-high thread count, mini-ripstop weave & a double cire heat treatment that also increases down-proofness.
The exceptionally low weight of Anti-Gravity Nylon also allows down to loft to its full potential with minimal restriction; meaning more warmth with less down, less weight & less bulk.
Our Verdict
Mont Adventure Equipment is an Australian company known for making high-performance gear for demanding alpine conditions, with a focus on low weight, precise design, and reliable materials. The Zero Ultralight Down Sleeping Bag is a clear example of that design philosophy.
Weighing just 294g (Regular), this hoodless, half-zip sleeping bag is designed for spring to early summer conditions. It packs down to around 1 litre, making it one of the most compact full-length bags in its category. The 1000+ loft goose down is treated for moisture resistance and held in place with vertical baffles for consistent insulation.
Breathability is good, thanks to the short zip and ultralight 7D Anti-Gravity Nylon shell, which allows the down to fully loft without restriction. Seams use hydrophobic thread to help prevent moisture from wicking through the stitching, and the fabric has held up well in repeated field use.
Best suited for mild nights or as a liner in cooler temps, this is a refined piece of minimalist kit that focuses on thermal efficiency and weight savings without compromising build quality.
- Reviewed by Ultralight Outdoor Gear
Features
- Perfect for Bike Packing, Ultralight Bushwalking, or as an extender
- The world's lightest full-size down sleeping bag
- Compresses to a tiny 33.8 fl.oz. (1L) package
- Made with Anti-Gravity Nylon inside and out, the World's lightest downproof Nylon: 7 denier with mini rip-stop, a
- thread count in excess of 520, double heavy cire downproof treatment, and weighing only ~21g/m2!
- 4.2oz. (120g) of 1000+ loft 98/2 Premium RDS White Goose Down with water resistant DWR Loft treatment
- Vertical baffles on torso maintain optimal down distribution
- 1/2 side zip using ultralight YKK #3 Zip weighs only 0.1oz. (4g)
- Mini-baffles with sewn through construction
- Sewn with hydrophobic Epic thread to prevent moisture from wicking along seams and inside the shell
- Hoodless construction
- Includes ultralight Nylon stuff sack & large storage sack
Specifications
- Regular Weight: 294g
- Long Weight: 327g
- Compression Sack: 97g
- Cold Sleepers:53°F / 12°C
- Warm Sleepers:42°F / 6°C
- Season Rating 2 Season
- Packed size* 4.7x10.2 inches (12x26cm)
Material & Construction
- Shell fabric Ultralight Anti Gravity Nylon
- Lining fabric 100% recycled ultralight silk-touch 15 denier downproof Nylon
- Down rating 1000+ loft premium RDS white goose down
- Down treatment Water resistant DWR Loft treatment
- Zip side: Left
- Zip configuration Ultralight 1/2 length side zip
- Colour Shadow/Black
