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  • SJK Sleeping Bag: Big Timber Pro

Big Timber Pro -20

Out Of Stock
The Big Timber Pro -20 sleeping bag is cozy and comfy - allowing you to sleep as if you've never left the comforts of home. We've updated the Big Timber Pro series by adding the "Big Toe" foot box. This larger footbox allows you to sleep on your back with your feet up in a natural & comfortable position. The "Big Toe" footbox provides additional comfort and effectively makes useable space inside the bag longer. This bag will take you back to a simpler time with memories of wood smoke and star filled nights.  Equipped with a soft flannel liner, durable canvas outer shell and robust zippers, Slumberjack Big Timber Pro bags are rugged, warm & cozy. 


  • Fill Weight: 5 lbs 12 oz
  • Carry Weight: 10 lbs 1 oz
  • Packed Size: 36 x 15 in
  • Fits to: 6 ft 6 in
  • Dimensions: 80 x 38 in


  • Insulation: Slumberloft™ Synthetic Insulation
  • Shell Fabric: 450D Polyester Canvas
  • Liner Fabric: Soft Poly-Cotton Flannel


  • Large "Toes-Up" footbox shape provides more room & enhanced comfort
  • Comfort Top folds forward and provides bed like experience 
  • Comfortable flannel liner feels like home
  • Durable Poly-Canvas shell
  • Durable #8 zipper with anti-snag construction
  • Zip two bags together to create double bag 
  • Slumberloft™ synthetic insulation
Gender: Unisex
Intended Use: Family Camping
Bag Shape: Rectangular
Insulation: Synthetic
Temperature Rating: -20 Degree
  • Product Reviews


    Write A Review

    1. Toasty

      Took it out and used in the open in sub 30 degree weather. Very nice can’t wait to use it more. on Mar 6th 2018

    2. Amazing as you'd expect from SJK!

      Warm and comfy and compacts to a much smaller size than expected. Thank you! on Nov 13th 2017

    3. Past Slumberjack experience

      Years ago I bought a slumberjack mummy bag. Tried it out and it failed miserably. The rating system was not even close to the reality of it's warmth factor. Contacted the company. They fed me a line of BS you would expect from a politician. Offered me a warmer bag at more cost. More cash out, and a failure again at the rating system. I do not recommend slumberjack for anything except three season use. I also understand the bags are imported now, with a corresponding loss of quality in areas other than the rating system. Buyer beware of very misleading sales talk... and not so good customer service if you have a problem. on May 12th 2017

    4. Big Bummer -20

      Slumberjack used to have intelligent design. No more. Slumberjack used to be made in the USA. No more. Slumberjack used to use YKK zippers. No more. This bag should be called a comforter with a crappy zipper. That's it. Big Bummer Disappointment. on May 11th 2017

    5. Backwoods & wilderness

      I do alot of hiking and backpacking, I am also a member of the High Sierra Volunteer Trail Crew, I've camped in the rain, snow and fridges temperature's at high elevation.
      I own 2 slumberjack bags, a lightweight synthetic 20° bag, & a heavy-duty canvas -20°, these bags are more than sufficient, the best bag I've ever owned, I have other bag like Big Agnes, North Face, that are really nice lighter weight for backpacking,
      I prefer the slumberjack over the others, especially when I'm on trail crew base camp. A+
      on Apr 8th 2017

    6. Comfortable yes, warm no

      I bought the BIG TIMBER PRO -20 for the newly designed big toe area which is great, lots of foot room. I would not call this a -20 rated bag. I have an older -20 rated SJK bag and have slept in it in temps in the teens and never felt cold in it. I slept in this bag in temps of the upper 30's and suffered all night, never felt warm in it. I'll surely use this bag for the big toe design, but I won't use it for temps below 40. on Nov 21st 2016

    7. Sleepingbag or bed?

      Very spacious. I'm a girl and 5'2" and I got lost in it! Natural feeling fabric, easy to pack up. Recommend. on Jun 29th 2016