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Instead of strapping your sleeping bag to the outside of your pack like a rookie, pack it down to a manageable size with the Outdoor Research UltraLight Compression Sack and stash it in your backpack. The four-strap design cinches the internal items down, and the lightweight siliconized  fabric slides easily into your pack.

  • Four-strap design provides compression
  • Wide range of sizes accommodates everything from jackets to sleeping bags
  • Drawcord closure is quick and secure
  • Ultralight design adds minimal weight to your pack
  • Siliconized fabric is water resistant and easily slides into your pack
  • End cap pocket stows small items or can store the compression sack when it's not in use

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Outdoor Research UltraLight Compression Sack

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Here's what others have to say...

Would 5,8, or 10L be best for my Marmot Lithium? Came with small marmot stuff sack, but not compression. Any ideas?

Responded on

The stuff sack that your Lithium came with should be 7.5x16 inches. I would recommend the 8L in this, since it will be the closest in size to the manufacturer sack. That way it will fit no problem and then you can compress it to a smaller size.

Unanswered Question

Anybody have a good idea of what size I could for my Marmot Plasma 0 long (normal stuff size 7.5 x 15)? I'm pretty sure I can get away with the 8L. Any possibility of the 5L?
Photo shows it in the included stuff sack next to a 40oz HydroFlask.

I have the Northface Dolomite Double Sleeping bag. Regular Length. Would 15L work for that?


Responded on

At a stuffed size of 12x24in, none of these compression sacks will cut it for your needs. Something like the "ALPS Mountaineering Cyclone Compression Sack" in the XL size would be better for you, although still a tight fit.

5 5

great stuff!

  • Familiarity: I've used it several times

this bag is great.... it cinches down well and seems to have good stitching all around. i use it to compress my optic 2.5 and it ends up no bigger than a bowling ball to fit great in my blackdiamond speed 55. i don't know whats not to love and honestly cant think of anything bad to say about it!

5 5

this STUFFS great!!!

  • Familiarity: I've put it through the wringer

See what I did there?

What you're looking at below here ladies & gents are two compression sacks sitting next to a Nalgene for size referencing. On the left we have a 10L Alloy compression with a 40 degree military down sleeping bag stuffed in it. Stuck in the middle is a 5L Lemongrass compression sack with a 2-4 person sleeping tarp stuffed down along with my size L rain jacket...and I could still probably fit a few extra articles in each if I really wanted to. These have both worked sufficiently from day hikes to 3-week long backpacking trips and for me the 10L and 5L have been perfect sizes to own for a variety of uses.

*READ THIS* If you are not familiar with these types of compression sacks and have never used them before, I HIGHLY recommend that you ask someone how to use them. Its not rocket science but If these types of compression sacks aren't stuffed down properly, I guarantee the clips will not last long at all. I am not aware if anyone has thought of using titanium or aluminum to make these clips yet but if not.. you saw it here first.

Hope this information helps in your next compression sack selection.

this STUFFS great!!!
Unanswered Question

What compression sack should i get i got...

What compression sack should i get i got a Sierra Designs Mobile Mummy Reg size. 8'' x 15''

4 5

Great Compression Sack!!

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

My wife and I are hiking the Camino de Santiago in the summer of 2014 and she will be managing 6 weeks with a 28L pack. I purchased the 5L compression sack to stuff her Northface Murcurial Bag Liner down a bit. Wasn't sure how small it would smash down to, but in the end it measured only 5.5 x 12 inches and fits perfect in the bottom of her small pack. I will review again after our trip when it has been packed and stuffed 45 times in 6 weeks.

I have a North face Aleutian 4s sleeping...

I have a North face Aleutian 4s sleeping bag its 77" long what size should I get

Responded on

You are probably going to want to go with the 15L on that one seeing as the sleeping bags original stuff sack is about 8 x 23 inches. This will make stuffing it into the compression sack just as easy will allowing you to really get it compressed into a smaller size.

What size should I get for a Western...

What size should I get for a Western Mountaneering Summerlight L?

Best Answer Responded on


You can pull off a 5L or go up to the 8L and have plenty of room in either. Your Summerlight long stuffs at 6x12" (WM specs are XXS in the stuff sack they provide), so a little shy with the 5L in the width, but more than enough in the length. If you really need to compress your bag, that's how it is, but over time, it's tough on the down and shortens the lifespan, not to mention that it requires extra time to get the bag lofted back up before bed. My WM bags are probably the one thing I never ever compress unless I absolutely have to, and 6x12" is already a very doable packed volume to begin with. Hope this helps.

Responded on


The 8 L works very well as a compression bag for the WM Highlite. It compresses to nearly the size of a softball! But like Phil said above the included WM 6"x12" is plenty small enough for me!

4 5

good stuffin sack

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

Got this for my Marmot 15 degree Teton bag. I ordered the 15 liter size and it fits my sleeping bag well. Stuffs it down enough that my bag will easily fit in the bottom of my backpack. The stuff sack is very light and I was scared that it was going to rip! So far it's held up, but we'll see how long the material lasts for.

Such a Lightweight & Versatile Sack!

Such a Lightweight & Versatile Sack!

We have three of these compression sacks. I always carry my clothes in one & I just found out that my 2 person tent fits perfectly in the 8L sack & compresses to half its original size. For being so lightweight they hold up really well!

Responded on

Anthony and Ashley any chance you think the Marmot Limelight 3p would fit in that 8L. Or would you jump up a size. Just bought a 3p tent and im looking shrink it down a bit. Thanks

5 5

OR Quality!

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

I purchased the 8L sack for my clothes in my pack & it is PERFECT for this! Super Lightweight! Quality! Perfect!

As soon as I put this sack through some real trail time I will let you know if my feelings change!

3 5

Great...but it rips

  • Familiarity: I've put it through the wringer

This bag is great at what it does, but one issue that happened is that where the strap is sewed to the top lid, the fabric ripped already. This happened on the first use! Not full quality like you would expect from Outdoor Research gear. Still using it, but disappointed.

Responded on

You should be able to return it to Backcountry, or call Outdoor Research who will replace it for free.

Responded on

Living in Central Asia makes it a lot harder to return something than living in the States. But when I get back I'll look into that.

5 5

My poncho liner fits perfectly.

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

I bought this to fit a blanket I bought at the PX in Kandahar but the blanket was too big. It needs the 8L. But my poncho liner fit perfect without too much bulk. Others have noted that there are no side cinches. I may get some straps and see if I can make that work myself. Planning on buying the 25L one for my sleeping bag. OR makes great gear. Looks like this is an updated version of the orange and gray ones on discount. It looks like the tube material on these is thinner and likely lighter. I also like the quick-release buckles.

5 5

does the job

  • Familiarity: I've used it several times

No way to lose the top of the stuff sack and is nice and light, I swapped out my tent bag for this to save on some space. ended up purchasing the 8L works perfect for the tent i own,The North Face Mica Fl 2.

5 5

very light and useful

  • Familiarity: I've used it several times

I bought two of these a 5l and a 10l for light backpacking.What I really needed was two of the smaller ones for summer packing. I was able to get my complete sleep system into tha small bag and will be able to get my complete colder weather system in the large one.weight listed was right on.

4 5

Gets the job done

I have the MontBell U.L. Super Spiral Hugger #0 Sleeping Bag: 0 Degree Down sleeping bag in regular length and it fits perfect inside the 15L compression sack. Fairly lightweight and it compresses well.