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The Backside Backsider X-Fibre 35

rated 4.5 of 5 stars

Excellent bag!

This bag's fill (The Backside's X-fibre) is very close to goose down in terms of weight and performance. The bag stuffs to the size of a football. Since I am allergic to down the X-fibre insulation is just perfect for me.

I purchased this bag to take the chill out of Wisconsin's cool nights which are in the 40+ degree range. The Backsider bag is just the ticket for a comfortable nights sleep!

This bag is very soft, the inside liner that is. It is polyester with an diamond ripstop outer shell. The contoured hood works perfectly. The width of the shoulders of this mummy measures 35 inches and the length of the same is 94 inches. Perfect for a tall guy like me!

I would most definitely recommend The Backside Backsider mummy bag. I purchased mine online through They had the best price of all the online outdoors retailers.

Great Bag!

Update: March 19, 2009

Currently I am using this most excellent mummy bag here at the Lamping Homestead Recreational Area here in Ohio's Wayne National Forest.

This bag is true to its +35 degree rating. Nights still drop to the 30's at night here in southeast Ohio. Love the bag's insulation: X-fibre. It is very close to the feel and performance of down being an synthetic fill, all without the allergic reactions I get from down. These Backside X-fibre bags are a great alternative to down bags in my opinion in terms of cost and performance. This bags stuffs to the size of a small loaf of bread. This bag has no cold spots that I can observe. Very warm and comfortable.

The hood works very well-one of the best I have used thus far.

Great bag. Forget those BIG name brands and get over it, get The Backside Backsider! You will be very glad you did!

Design: mummy bag
Fill: X-fibre
Temperature Rating: 35 degrees farenheight
Weight: 2.2 lbs
Price Paid: $66.56

I lived just off the AT for four years and used this bag and the 0 degree version every year for the past 3 years. For the life of me I can't understand why they aren't extremely popular. It feels as close to down as you are going to get with a synthetic, and I survived a HORRIBLE night in the 0 degree bag with -15 windchill with nothing but a groundpad, tarp and this sleeping bag. Did it suck? Yeah, did I wake up with my bag COATED in ice? Yeah. Did I get sick? No.

These bags were such a great deal that I own two different temp ratings of the same company. The baffle is good, doesn't hang up if you pay attention. The hood is fantastic. If you can find a better bag for $50 more, I haven't seen it. And I LIVED in a trail town.
Very very light and competitive for a big man's bag.

Drawbacks: chest baffle chord should be lower. Gotta get the hang of it. And if you are not tall, or you don't desire a LOT of room, this bag is not for you (or at least the model i have, in 2002 when i bought it, they only sold the big size). I sleep warm anyway, and cold spots are not an issue for me, but if you aren't over 6 feet, forget it. If you are, and you buy something else, you are a fool.

Design: mummy
Fill: proprietary. best synthetic down i've ever seen
Temperature Rating: 35
Weight: can't remember, look at specs
Price Paid: $75

Packs small and light and keeps you warm. I have used mine down to 20 degrees with a liner.


  • Packs small
  • Lightweight
  • Warm


  • I am not a big fan of the hood.

I have used my Backside on canoe trips in the Boundry Waters, Minn., and down the Eleven Point River in Missouri. I cannot pack as much as I used to so I appreciate the lower weight and the ability to compression bag it down to a small size.

Never had an issue with being warm and I have used it with temperatures in the 20's.

Source: bought it new

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Price Historic Range: $74.50
Reviewers Paid: $66.56-$75.00
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