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People have likened climbing into the Sierra Designs Utopia Sleeping Bag to being in the womb. While the feeling of warmth and serenity might be comparable, this three-season synthetic bag is much more breathable and conducive to movement than most of the wombs we know of. It weighs a reasonable three pounds, packs compactly, and boasts enough insulating power to keep you comfy during cool fall nights or high-altitude summer backpacking trips.

  • An EN lower-limit rating of 34° F means that this bag is best used for summer trips in the mountains and for three-season use at lower elevations
  • HeatSync synthetic insulation compresses well and retains warmth even if it gets slightly wet
  • Offset Layer baffles reduce heat loss and cold spots
  • Flex stretch construction allows seven to eight extra inches of girth and helps eliminate dead air space inside the bag
  • Tough ripstop shell withstands trail abuse and feels soft against your tired body
  • A zippered draft tube, adjustable collar, and hood seal you off from chilly summer weather
  • Shaped footbox doesn't restrict your natural sleeping position
  • A pillow pocket lets you insert a hoody or camp pillow (sold separately) for maximizing your sleepy times
  • A zippered chest pocket holds your headlamp for your nightly trip to the designated bush
  • Pad Locks hold your sleeping pad underneath so it stays put

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Here's what others have to say...

What is the size of this in its stuff...

What is the size of this in its stuff sack?


The 15 degree version comes in at 10 x 18" for it's stuff size. Being that the 30 degree will have less insulation, it should be around 8x15".


Handled a rainy night well.

  • Familiarity:I've used it once or twice and have initial impressions

I tried this bag out on a very rainy overnight hike recently, I didn't tuck in my tent's ground cloth (accidentally) so I ended up with a puddle by my feet. Overall the bag was warm, I believe it got to the mid 40's (F). It works, it is light weight and it is relatively cheap.


Excellent for side sleepers!

  • Gender:Male

This bag was recommended as a good choice for a side sleeper who likes to also move around a lot. That's me. This bag lived up to the hype. I used it on two recent camping trips and have slept the best ever in those settings. Well worth the money, and looking forward to many years of use!