6 imagesSierra Designs Synthesis 20 Degrees Sleeping Bags, Red/Black, Long, 90613419L
Sierra Designs Synthesis 20 Degrees Sleeping Bags, Red/Black, Long, 90613419L
Sierra Designs Synthesis 20 Degrees Sleeping Bags, Red/Black, Long, 90613419L
Sierra Designs Synthesis 20 Degrees Sleeping Bag, Red/Black, Regular, 90613419R
Sierra Designs Synthesis 20 Degrees Sleeping Bag, Red/Black, Regular, 90613419R
Sierra Designs Synthesis 20 Degrees Sleeping Bag, Red/Black, Regular, 90613419R
Sierra Designs Synthesis 20 Degrees Sleeping Bag, Red/Black, Regular, 90613419R
Sierra Designs Synthesis 20 Degrees Sleeping Bag, Red/Black, Regular, 90613419R

Product Discontinued by Manufacturer

Sierra Designs Synthesis 20 Degrees Sleeping Bag has been discontinued by Sierra Designs and is no longer available. Our product experts have helped us select these available replacements below.You can also explore other items in the Camp & Hike, Sleeping Bags, Car / Base Camping Sleeping Bags yourself to try and find the perfect replacement for you!

Product Info for Sierra Designs Synthesis 20 Degrees Sleeping Bag

Built with synthetic insulation and lightweight material typically reserved for a higher price point, the Synthesis packs light but hits heavy with its feature set. A dual zipper system makes getting in and out a breeze and gives you room to move about, while the self sealing foot vent lets you vent heat with ease.image

Features of Sierra Designs Synthesis 20 Degrees Sleeping Bag:

  • Key Features:
  • Synthetic insulation provides lofty warmth, even when wet
  • Dual zipper system for ease of use
  • Patented self-sealing foot vents for fast and easy ventilation
  • Draft dodger collar helps prevent drafts
  • 20D nylon fabric for lightweight versatility
  • LONG:
  • EN Limit Temp Rating: 20F / -6C
  • EN Comfort Temp Rating: 31F / 0C
  • Fill Weight: 31.2oz / 886g
  • Minimum Weight: 2lbs 12oz / 1247g
  • Fits Up To: 6' 6" / 198 cm
  • Length: 82in / 208 cm
  • Shoulder Circumference: 64" / 163 cm
  • Hip Circumference: 58" / 147 cm
  • Footbox Circumference: 42" / 107 cm
  • Mesh Stoarge Bag Size (LxW): 20 x 12" / 51 x 31 cm
  • Stuff Sack Size (L x W): 15 x 7.5" / 38 x 19cm

Package Contents:

  • Sierra Designs Synthesis 20 Degrees Sleeping Bag
Customer Reviews for Sierra Designs Synthesis 20 Degrees Sleeping Bag Read All (4)
Most Recent Reviews
by albin, Verified Owner from WA, United States Updated on May 24, 2025
This sleeping bag is advertised that weight is 2.56 lb but when I weigh it it shows 3.196 lb. I weight it because when I receive it I knew it is heavier like it is advertised. When you are backpacking you count every little bit of weight that you carry . It is good and warm bag but it`s a bit heavier like I expect it
Pros:
  • None
Cons:
  • heavier like I expect it
Most Recent Reviews
by ser, Verified Owner from DE, United States Updated on February 14, 2024
This is a great mummy style sleeping bag, with the added flexibility of being more roomy than a tradition mummy with the two zippers. I bought a regular size for my husband who is 6ft tall, 185lbs, and it is tight if he wants to sleep on his side. Probably should have sized up to a long, but we’ll make this one work. It’s very warm and comfortable, and stuffs amazingly small fo...
Read more
Most Recent Reviews
by ser, Verified Owner from DE, United States Updated on January 5, 2024
The best compact sleeping bag I have ever owned.loved this bag very very warm
Most Recent Reviews
by ser, from DE, United States Updated on February 23, 2023
Overall this is a very good bag with some really nice features, double sided zippers and the foot vent. Everyone needs to remember that the 20º rating is extreme and not the Comfort temperature. I would really like a 10º bag for the temp range I camp early in the year.
Questions & Answers for Sierra Designs Synthesis 20 Degrees Sleeping Bag No Questions Asked Yet

Sleeping Bag Accessories

1–25 / 25
Previous
Next

Outdoor Essentials

1–60 / 60
Previous
Next

Sierra Designs Synthesis 20 Degrees Sleeping Bag Unavailable & Discontinued Models

List of Unorderable Models

  • Sierra Designs Synthesis 20 Degrees Sleeping Bags, Red/Black, Long, 90613419L , MPN: 90613419L , UPC: 054003812054 , Code: Z58-SI-S32DE-90613419L
  • Sierra Designs Synthesis 20 Degrees Sleeping Bag, Red/Black, Regular, 90613419R , MPN: 90613419R , UPC: 054003812047 , Code: Z58-SI-S32DE-90613419R
Compare (0)