Sierra Designs Mobile Mummy SYN Sleeping Bag: 25 Degree Synthetic

Unconfined comfort.

On those really cold hiking days sometimes the only thing that keeps you going is knowing there's a warm sleeping bag waiting for you back at camp, but unless you plan on staring at the walls of your tent for the rest of the evening, you aren't really going to be able to enjoy the simple pleasures of your sleeping bag until you're conked out for the night. With the Sierra Designs Mobile Mummy SYN Sleeping Bag you can enjoy the warmth and comfort of your bag as you stroll about camp while sipping a hot toddies, snacking on some gorp, and making a plan for tomorrow's adventure.

The design of the Mobile Mummy is just as its name suggests, a mummy bag you can walk, talk, and eat in. This is achieved through zipperless arm and leg ports through which you can easily put your limbs. Each port is backed by a draft tube to prevent cold air from seeping through while you sleep, and the foot box easily attaches to toggles at the back of the bag to prevent it from dragging while you take a walkabout. The hood and shoulders of the bag are modeled after a jacket for a comfortable fit and feel while you're sleeping and walking, and the nearly full-length zipper is at the center front of the bag so you can lose a bit of heat and step in and out with ease. This synthetic version of the Mobile Mummy is ideal for warmer, wetter climates and is comfort rated to 34F with a lower limit of 24F, making it ideal for late spring, summer, and early fall camping and backpacking trips.

  • 25-degree Fahrenheit sleeping bag
  • Poly-fiber synthetic fill
  • Zipperless arm ports
  • Jacket-style hood
  • Stowable footbox
  • Mummy shape
  • 30D polyester ripstop shell
  • 30D polyester taffeta lining
  • Center front zipper
  • Garment-style shoulder design
  • Draft collar, tube, and curtains
  • Reviews
  • Q & A


  • Familiarity: I've used it several times

I am not sure why all sleeping bags are not designed like this and why more people are not buying these bags. I used this bag on a 4-day trek on the AT and loved it. One night we had temps that dipped down in the low 20's and this bag kept me toasty all night. The design is perfect zipper is easy to get to and convenient. The hood doesn't require you to fool with drawstrings and if you get thirsty just stick an arm out and get your drink of water.

Dance in your Sleeping Bag!

  • Familiarity: I've used it several times

This bag give me the best sleep i have had in my hammock! Had to go restroom no problem, just went to the bathroom in my bag and back to sleep! I am not a big fan of how down smells to me when it gets damp, i have the Sierra Designs sleeping bed in a 600 down and from what this offers it is much warmer to me. Ever wanted to sleep with your arms out the sleeping bag? Well you can with this one! And the hood is like WOW Awesome! This is my 4th sleeping bag and out the 4 i love this one the most! AT here i come in March! Thanks for speedy shipping!

Poly Fiber Synthetic