Mont ZERO SL 2/3 Season Ultralight Sleeping Bag


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The Zero SL Sleeping Bag is perfect for 2 to 3 season ultralight adventures with 1000+ fill power RDS goose down. From bike packing where every gram counts, to multi-day walks in the tropics.

The Mont Zero range is the holy grail of ultralight 2/3 season sleeping bags. We have made every gram count to give you one of the lightest, full-sized sleeping bag range on the market. The Zero SL is filled with 230g of 1000+ loft RDS goose down and weighs in at only 417g. The Zero SL Down Sleeping Bag is appropriate for temperatures as low as 2°C and accommodates a user up to 203cm tall (XL).

The Zero SL Sleeping Bag is perfect for 2 to 3 season ultralight adventures. From bike packing where every gram counts, to ultralight multi-day walks. And because of its tiny packed size and super light nature the Zero SL can be used as an extender to your existing sleeping bag, or as a just-in-case for backpacking odysseys.

Anti-Gravity Nylon is an ultralight fabric that enhances the performance and reduces the bulk and weight of down sleeping bags. The exceptionally low weight of Anti-Gravity Nylon allows down to loft to its full potential without restriction; meaning more warmth with less down, less weight, less bulk.

  • Perfect for Bike Packing, Ultralight Bushwalking, or as an extender
  • Vertical baffles on the torso maintain optimal down distribution
  • Contoured hood for increased warmth
  • 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.
  • 275g of 1000+ loft 98/2 Premium White RDS goose down with water-resistant DWR Loft treatment
  • 1/2 side zip using ultralight YKK #3 Zip weighs only 4grams
  • Mini-baffles with sewn through construction
  • Sewn with hydrophobic Epic thread to prevent moisture from wicking along seams and inside the shell
  • Includes ultralight Nylon stuff sack & large storage sack
Intended useUltralight Adventure
Season Rating2-3 Season
Women &/or Cold Sleeper8°C / 46°F
Men &/or Warm Sleeper2°C / 36°F
Shell fabricUltralight Anti Gravity Nylon
Lining fabric100% recycled ultralight silk-touch 15 denier downproof Nylon
Standard size weight230g fill, 417g total
Packed size*12x26cm
Down rating1000+ loft premium white goose down
Down treatmentWater resistant DWR Loft treatment
Zip sideLeft
Zip configurationUltralight 1/2 length side zip
*Can be compressed smaller using compression sack
1000+ loft water resistant down

This product is filled with Premium White Down with a loft rating of at least 1000 cubic inches per ounce.

Mont’s down is selected for it’s high quality, purity and the fact that it is not live plucked.


The World’s lightest downproof Nylon: Anti-Gravity Nylon. Superfine 7 denier threads are woven at over 520 per square inch producing an incredibly light & super smooth downproof fabric: Anti-Gravity Nylon weighs only approximately 21g per square metre!

Hydrophobic Epic Thread

All Mont Sleeping Bags are sewn with hydrophobic Epic Thread. The silicon impregnated in this thread prevents moisture wicking along seams and into the bag, keeping down dryer and warmer.


RDS is an independent, voluntary global standard that ensures down is not sourced via live plucking, that birds are not force fed & that a birds welfare is always upheld.

Certified by IDFL
Project #: 005963


Differential cut is the term used to describe the difference in circumference between the inner and outer shells. The differential cut prevents down compression and cold spots by reducing the chance of the inner shell compressing against the outer shell.

For a truly effective differential cut there should be a considerable difference in the circumference of the inner and outer shells.