Sierra Designs Utopia 15 Degree Synthetic Camping Sleeping Bag – The Utopia 15 Degree Synthetic sleeping bag by Sierra Designs is a great year-round bag. Its also a great choice for three season cold sleepers. This bag combines HeatSync continuous-filament insulation with Flex technology to deliver tough to beat quality in a light, durable design. For superior comfort and heat retention, Sierra Designs incorporates Flex technology into several insulated jackets and sleeping bags. With elastic built into the baffles of both down and synthetic jackets and bags, Flex technology hugs the body, eliminates dead air space, and keeps warm air close to the body. And beyond just keeping you warmer, Flex jackets and sleeping bags move with you for better mobility and a more comfortable night’s sleep.The Utopia 15 Degree Synthetic sleeping bag by Sierra Designs is your go to bag for those over nights spent in the teens.

Temp Rating: 15° / -9°C
Shape: Mummy


EN Comfort Limit: 28oF / -2oC
EN Lower Limit: 16oF / -9oC
EN Extreme Limit: -17oF / -27oC

Size Regular:

  • Fits to: 6’ / 183 cm
  • Length: 78” / 198 cm
  • Zipper Side: Left
  • Shoulder girth: 57 – 65″
  • Hip girth: 53 – 61″
  • Footbox: 35 – 43″
  • Fill weight: 37 oz. / 1.0 kg
  • Total weight: 3 lb. 9 oz. / 1.6 kg
  • Stuffed diameter: 9″ / 23 cm
  • Stuffed length: 19″ / 48 cm

Size Long:

  • Fits to: 6’6” / 198 cm
  • Length: 84” / 213 cm
  • Zipper Side: Left
  • Shoulder girth: 59 – 67″
  • Hip girth: 55 – 63″
  • Footbox: 37 – 45″
  • Fill weight: 40 oz. / 1.1 kg
  • Total weight: 3 lb. 13 oz. / 1.7 kg
  • Stuffed diameter: 9″ / 23 cm
  • Stuffed length: 19″ / 48 cm


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