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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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Here's what others have to say...

4 5

Works just fine

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

Well, I've only used it a couple of times now. The 15L fits my 12 degree down bag just fine and gets it down to a very small size. Overall I'm satisfied with it. I will probably update when I have used it further. The first time tightening the sack it made some scary noises near the seams I think it was, but maybe that's just a one time thing. Maybe I tightened it too much because I do have a lot of strength behind me, not sure. We will see if the seams hold up in the future. As of now the sack seems like it's pretty good quality for the price.

5 5

Oh, technology...

  • Familiarity: I've used it several times

So I held off on buying a compression sack for a long time because every time I would go to buy one, I would be frustrated with how expensive they were - do I REALLY need to spend that kind of money on a sack??

The answer is yes. OMG does it make a world of difference!! I didn't buy the waterproof one simply because this one is water resistant, and I have a cover for my backpack if it does rain. But let me tell you...I put my down sleeping bag in here with a bunch of clothing and that thing compressed down to the size of a volleyball. Saves SO much room! I originally bought the 20L one, but then I saw a sale and decided to get a 15L one as well and now I've started my collection of compression sacks. I don't only use these for backpacking - I also use them just for traveling in general and you can fit so much more into a small suitcase. Truly amazing! Whoever said "hey, let's put straps on this thing so that you can tighten it down to nothing"....I thank you.

And at night, it's great because I use this as my pillow, although it does slip around a bit. My last trip, it was fairly warm so I left my sleeping bag open a bit, and I put this inside my mummy head so it stayed put and was comfy all night long.

4 5

Awesome lightweight breathable sack

  • Familiarity: I've used it several times

I bought an 8 L hoping to stuff a 0 Deg Marmot bag in it. It was wishful thinking. The bag is great though so I kept it to put clothes in for multi day backpacking trips. It has just the essentials so it stays lightweight but it's good quality. Doesn't feel like it's going to rip anytime soon.

Bummer!! I called Backcountry and gave the bag specs to one of their experts who recommended the 8L after looking at the bag specs online and my mentioning that the bag has significant volume and I just didn't want to get the wrong size and go through the return/exchange hassle. We'll have to see after the UPS man brings the package. Thanks Spencer.

You may be alright Huge. The Gearheads are pretty knowledgeable and usually their recommendations are spot on. If you do end up having to go through the returns process they'll take good care of you. I am using a "long" length bag and was still very close to fitting.

No go my friend. It is like like trying to stuff 10 pounds of "you know what" into a 5 pound bag. Debating on returning the sack. I ended up getting a 31 liter Granite Gear Block Solid Compressor Bag for $19.95 from Left Lane Sports. I should be able to compress the sleeping bag and liner for sure and anything else I may see fit.

Sounds like a plan. Sorry it didn't work for ya. I had the same debate but I'm actually really glad I kept it. It's awesome for organization.

I called to schedule a return. No hassles sending it back very professional treatment. It is hard to gauge what fits in these sacks without having the product in front of you. I appreciate the resolution and will buy from Backcountry in the future.

I have an Alps Red Creek 0 degree sleeping bag. Which compression sack size would be the most appropriate? Thanks in advance for your kind reply.

Best Answer

I tried to fit a 0 Deg Marmot bag in an 8 L and it was a no go. It'll depend on the sleeping bag, but mine being an 875 fill power 0 deg bag I think I could've gotten away with a 10 L just barely

Unanswered Question

What size sack for Sierra Designs Backcountry 600 sleeping bag and also what size for REI 2+ half dome tent? I'm think 15L for sleeping bag and 8L for tent. Would 8L be sufficient for 3 days worth of clothing as well?

Can I fit marmot limelight 2p in a 8 liter compression sack,tent,fly,and footprint?

Hey Pasha,
No, I think you'd need a 15L. It will compress down. but the tent is fairly bulky.

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

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?


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

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


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.


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!

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.

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

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.