Vireo Nano Sleeping Bag

The Vireo was designed with a single purpose in mind; fast and light alpine climbs where every gram counts. With no hood, no zipper and a variable fill (the lower half is rated at 25ºF / -4ºC, the upper half 45ºF / 7ºC) the Vireo shaves every last ounce. For maximum efficiency and warmth, pair the bag with a down jacket to not only keep you cozy but also minimize extra gear and weight when it matters most.

Nano: Schoeller® NanoSphere 20 denier water-resistant/ breathable fabric.

Best Uses: Ultralight Backpacking, Alpinism, Emergency Bivy

Availability: Select color & length for availability

Availability Information

From: $249.00

* Required Fields


  • No zipper to conserve weight and bulk
  • Drawcord on open end to cinch off apertures
  • Designed to be worn with a down jacket for upper-body warmth
  • Differential fills - lower half is filled to 25ºF / -4ºC while the top half is filled to 45ºF / 7ºC
  • Stuff sack and cotton storage bag included

Additional Info

Dimensions 64" / 48" / 38"
Fill Power 900+ Goose Down
Fill Weight 62" 8.0 oz / 227 g
68" 8.7 oz / 247 g
74" 9.4 oz / 267 g
Lining Fabric Pertex® 30 denier nylon taffeta
Country of Origin Made in Seattle, USA of imported materials
Packed Size 7" x 10" | 5L
Average Weight 62" 16.4 oz / 466 g
68" 17.8 oz / 506 g
74" 19.3 oz / 546 g
Sleeping Bag Shell Fabric Schoeller Nanosphere®

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