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  • Sea To Summit - eVent Compression Dry Sack - One Color
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  • Sea To Summit - eVent Compression Dry Sack - One Color

Sea To Summit eVent Compression Dry Sack

$29.95 - $49.95

Free 2-Day shipping on orders over $50*

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    • One Color, S/10L
    • One Color, M/14L
    • One Color, L/20L
    • One Color, XL/30L
    • One Color, XS/6L

    172 Reviews


    Shave weight off your compression sack system, and make it waterproof by switching to the Sea To Summit eVent Compression Dry Sack.

    Sea To Summit used waterproof breathable eVent material to make the first waterproof compression bag without a valve—the eVent Compression Dry Sack. Close this Sea To Summit compression sack, and the breathable material vents air as you cinch the compression straps. No more soaked sleeping bag after a rainy day, and no more valve poking you in the back as you hike. On top of the water protection and low bulk, the eVent Compression Dry Sack weights a scant 5.2oz (medium size).
    • Item #STS0002

    Tech Specs

    (xs) 6-2 L, (s) 10-3.3 L, (m) 14-4.5 L, (l) 20-6.7 L, (xl) 30-10 L
    [XS ] 6 x 14 in, [S ] 7 x 16 in, [M ] 8 x 18 in, [L ] 9 x 20 in, [XL ] 10.5 x 23 in
    roll-top with compression straps
    Backpack Straps
    Claimed Weight
    (XS) 3.7 oz, 4.5 oz, 5.2 oz, 5.9 oz, 7.4 oz
    Manufacturer Warranty
    1 year

    Tech Specs

    • Reviews
    • Q & A

    What do you think about this product?

    Have questions about this product?

    Kept my down bag perfectly dry

      I used this bag while floating the San Juan a few weeks ago and had incident where the bag went overboard and floated/submerged for about a minute. After opening it up that night it was still perfectly dry.

      Sleeping Bag Armor

      • Familiarity: I've used it several times

      Finally got a STS product after hearing lots of great things. This bag has not disappointed. I have a Klymit KSB 20 sleeping bag and I got it to fit in the size Small, but it would have been tiresome to stuff it in there every morning in a tent. I went with the size Medium and it fit nicely! I can even put my pillow in there too.

      I could see these being handy for multiple uses. Clothes, down layers, electronics even. They really are easy to compress and so far it has stayed dry.

      Size matters

      • Familiarity: I've put it through the wringer

      So I recently upgraded my sleeping bags. For winter camping a 0° marmot Lithium and summer the 40° marmot atom both are longs. It's important to me to be absolutely sure my sleeping bags will always be dry, which led me to replace the stuff sacks that came with the bags. I have a spare 20 L dry bag this was impossible to use, I couldn't control the compression, roll the top up and bleed the air, in the end the whole thing just ended up to big. After talking with my gearhead he recommended these compression sacks. The E-vent works great let's air out not in so you can roll the top-down then cinch those straps down for a very small package. Use the 10 L small sack for your summer and the 14 L M for your winter bag. No I'm not a big fan of adding weight to my pack So ditch Your pillows stuff sack and stuff pillow into the bag, It belongs there anyway to help keep the pillow dry. Since I bought these bags I also realize there is a lighter weight version of this bag. I gave these two bags to my son and I ordered two lightweight ones for myself .

      The perfect compression/dry sack!

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

      I purchased the L sack and found that it could handle my Big Agnes Encampment sleeping bag and my Big Agnes Double Z Double Stuff pad with a little room to spare. This is one tough bag that can really take a beating. Once I fill it up, I don't just pull on the straps but I really press down on the top of the bag. The amount it can handle is incredible. The eVent works perfectly. Add in the waterproof and you have an incredible bag.

      Literally, a Life Saver

      • Familiarity: I've put it through the wringer

      I swear by this product for keeping my sleeping bag dry.

      My first one I used hiking the AT, 19 months of guiding in the field, and a year abroad (six months of which were spent in the bush of NZ, and the Himalayas of Nepal during monsoon season). Towards the end of my trip abroad it developed a small leaky area, which is why I'm replacing it. My pack has been in the back of a trailer for a deluge of rain, and my down sleeping bag has been desert dry. Also that one time I had to sleep under a rocky overhang on a ridgeline during a storm? Yeah, my bag was dry then too and kept me from getting hypothermic.

      Buy it. Seriously, you won't regret it.

      needed a bigger one

        I bought a large to put my double sleeping bag in. It fits perfectly with some room to spare and makes carrying one bag between the both of us way easier! This is my third one of these.

        awesome for my sleeping bag

        • Familiarity: I've used it several times

        I have the North Face Cat's Meow synthetic sleeping bag and this bag fits in the Medium size perfectly...I also was able to fit an inflatable pillow along side of it in the compression sack...its perfect for long backpack trips.

        As Advertised

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

        Keeps thing dry and compact. I use this for my heavy down 0 degree sleeping bag. Synches that sucker up nice and small like. Have yet to test the drybag aspect, but I'll give her a go on some river excursions in the spring.

        Still standing strong

        • Familiarity: I've put it through the wringer

        This was my first ever compression sack to buy. I usually use this one for my clothes and then I use it as a pillow when camping. This thing is pretty waterproof. Mine does have a few stains on it now. The straps are easy to pull and can get compressed really small. I WILL always recommend this brand.

        If you have gear questions feel free to reach out to me directly!


        • Familiarity: I've used it several times

        I had never used a compression sack for backpacking but after using 2 of these (20 & 30 L) I'll never go back to anything else. I might even lose the packcover. These are amazing!!!

        keep it dry and compact

        • Familiarity: I've put it through the wringer

        The compression dry sack is super lightweight and easy to stuff full of your essentials for hiking and in my case bike packing from Banff to Whitefish, MT. I was able cram loads of items into 14L and 6L. I also found the eVent material to be durable and trustworthy.

        keep it dry and compact

        Keeps you coming back for more!

        • Familiarity: I've put it through the wringer

        I just bought another one of these awesome compression sacks for my down sleeping bag. I have had one for years and it is great for backpacking. It is the best way to compress a sleeping bag and keep it dry at the same time (essential for down bags). If you need to save space and keep something dry, then this is the compression sack for you!

        I got the Small (10L), and it was the perfect size for my Marmot Sawtooth 15 Degree Sleeping Bag (in the regular length).

        So good, I've got two!

        • Familiarity: I've used it several times

        I love these bags, I have the L and the M, I can stuff my sleeping bag and some clothing items into the M and then tons of clothes and other gear into the L. The compression is great and I primarily use it for hiking / backpacking. Not sure how great the waterproofing is as I've never submerged it or used it on river trips, but will update this summer after a rafting trip in Colorado.

        Great bags

          I have a few of these in multiple sizes and love them. Haven't fully submerged one yet, but when I do I'll make sure the stuff in there isn't super sketchy with water, because I'm not 100% sure it would stay waterproof. Will report back when I do try it though!

          Update: so I used one of these canyoneering last weekend, being fully submerged in Neon and Choprock canyons several times. the t-shirt smashed at the bottom of the bag had 2 damp spots on it, everything else was bone dry. Highly recommend!

          Best Bag Ever

          • Familiarity: I've put it through the wringer

          I've owned a lot of different bags, and always go back to this model...

          Its waterproof and tough. I've put my through a lot of abuse and it's still sticking strong.

          It survived racing the Continental Divide, fully exposed to the elements. And I've even dropped it in a river, and have never had a wet sleeping bag!

          Best Bag Ever

          Winter bag blues...

          • Familiarity: I've put it through the wringer

          The problem with going out in the winter is that your bag takes up a ton of valuable pack space. If you don't want to carry around a tower of power, pick up a compression sack for your bag and down clothing. I have found the Sea to Summit eVent sacks to work the best for burly 4 season bags. They can be tricky to size, but work really well to help you save space. If using a Gore shelled bag, stuffing inside out helps a ton. Handy option and easy to size up and stuff in your extra clothes and/or down clothing for the end of the day. Durability has proven itself following many trips when cranking the compression straps down to save a few extra inches seemed like it might stress the straps/stitching, no failures. Great for winter bags, but also tight spaces like small/lighter packs, drift boat dry storage bins and easily compresses down a down jacket and gloves to fit into your touring pack for those longer days (or longer stops).

          Not waterproof

          • Familiarity: I've used it several times

          Great at compressing, not at waterproofing. I've experienced water leakage multiple times when using this bag. It's probably fine for hiking as a backup when it's in your pack, but for kayaking or other activities where there will be a lot of direct water contact, beware! Go with a sack that is truly waterproof, even if that means a little extra air gets packed in.

          Hi, I have a north face furnace 20 down bag. Which size should I get?

          Best Answer

          Connor, the Medium will be able to fit that sleeping bag in there though it might take some effort. You could always bump up to the large and put some other layers in the bag that you dont intend to wear much while actually hiking. For instance, I dont really ever plan to wear my down jacket while hiking but, really like it around camp and sometimes to sleep in, I toss this in there with my sleeping bag.

          Feel free to hit me up at or 801-736-6398.

          Unanswered Question

          I'm wondering what size/ or how many liters I should be looking for in a compression sack? I just bought the Kelty women's 33 degree sleeping bag. It's 9" x 15" and I need to be able to fit it into the bottom of my Osprey 36 L backpack. Thank you so much!

          Got a Mammut Alpine UL-3 sleeping bag I, think compressed size is 10.2x5.9 and compression bag that came with sleeping bag is to hard and technical for my 11 year old scout. what is right size that will make it easier on him?

          Best Answer

          The XS will be a little bigger than what came with the sleeping bag. However, if you want it to be really easy on him, go with the small. You should still be able to compress it way down and save a lot of space.

          More Questions? Contact me directly.

          Emily Jenson

          Expert Gearhead


          The stuff sack that came with my sleeping bag is 7.5" x 16" so would you recommend the small or medium compression sack?

          I'd go with the medium, so it's easy for you to put the sleeping bag in the sack. Then when you compress it, it will get quite small.

          More Questions? Hit me up!

          Emily Jenson

          Expert Gearhead


          Unanswered Question

          what size should I buy for my Nemo Women's Rhapsody 15 Sleeping Bag?

          Unanswered Question

          Just purchased the Big Agnes Wind Lip Sleeping Bag: 28 Degree Synthetic. Can you suggest which size I should go with?

          What size should I get for a North Face Reg Kazoo 15 degree down sleeping bag. Calculated the stuff sack size to be 17 L cannot decide between the L or XL.

          Unanswered Question

          What size would work for the rei siesta double bag that unzips into 2 bags? Thanks :)

          What size do I need for my WM puma bag MF 6ft6?


          Hey Danny,

          So the Western Mountaineering Puma Super MF Sleeping Bag: -25 Degree Down in a 6ft 6in version has a packed size of 10" x 20"

          This comes to be 1571 cubic inches or 25.75 liters.

          So for 26 liters, I'd suggest the XL of this stuff sack.

          Shoot me an email if you have any questions at all!

          Jared D.

          Expert Gearhead



          How did this work out? I have the same WM bag in a regular and I was able to use the L stuff sack, but it was more challenging. I easily fit it into the XL, but felt that it could have been compressed a good bit more.

          I'm looking to buy this for my -20 Crosho Big Agnes bag. I was thinking of buying the large but I am unsure if that would be the correct size. Any size suggestions?

          The supplied stuff sack your bag comes with is 10x21.

          The large sea to summit is 9x 20 and the xl is 10.5 x 23.

          I would most likely go with the XL depending upon how difficult it is to get it in the supplied stuff sack. You are going to get it to compress down to the same size no matter what between the two. I would just look at wrestling the thing into a slightly smaller bag or having an easier time with a bit larger one.



          Best Answer

          Jennifer, It states that your bag stuffed is 10.9 liters. I would say the Medium would be the one to get as it maxes out at around 14 liters giving you a bit of extra space to get it all in and then allowing you to compress it down.

          what size for the new Mountain Hardwear...

          what size for the new Mountain Hardwear Optic 2.5. if anyone has one im sure you can see the sack it comes in doesnt compress and is far too big for it. but love that tent!

          Best Answer

          According to the REI website (, it's packed size is 7 x 23 inches; I don't know how much smaller than that you can get it when it isn't sacked up in it's factory stuff sack, but I've included a picture of a Medium-sized one of these, with a regular size Nalgene bottle for a scale reference, since nearly everyone has one of those. As you can see from the pic, the medium is pretty freaking large, so depending on how closely you can get it packed to Nalgene size, I would go with the size closest to that.

          Hope this helps.

          According to the REI website (, it's packed size is 7 x 23 inches; I don't know how much smaller than that you can get it when it isn't sacked up in it's factory stuff sack, but I've included a picture of a Medium-sized one of these, with a regular size Nalgene bottle for a scale reference, since nearly everyone has one of those. As you can see from the pic, the medium is pretty freaking large, so depending on how closely you can get it packed to Nalgene size, I would go with the size closest to that. 
Hope this helps.

          What size compression sack to get for an...

          What size compression sack to get for an older Kelty sawtooth 20 degree bag? Finished size is 32 x 84 inches. Weight of filling material is 48oz. Filled with Polaguard.

          Small or Medium for a The North Face...

          Small or Medium for a The North Face Hightail 3S? The original stuff sack says 17x9", but I think I could go much smaller...

          Best Answer

          Personally I try to get a stuff sack as close to the original size as possible because what that is going to effect the most is how easy it is to stuff your bag into the sack. That doesn't mean you can't go smaller because obviously the bag will compress and fit into a much smaller space, but its a matter of how much do you want to wrestle with your bag in the morning to save an inch or two? Personally I would rather spend that extra 30 seconds sipping coffee in the morning and go with the Medium but I also have a 90L pack so space isn't an issue.

          The Medium ended up working well for me-- easy to stuff and packs down smaller than the included sack. Tried the Small and it was indeed almost impossible to get the collar to roll down enough times to be waterproof

          I have a North Face Aleutian 3s 20 degree...

          I have a North Face Aleutian 3s 20 degree bag and the stuff size dimensions are 9 X 16. It is too big for my backpack compartment and I was wondering which compression sack would be best and how much would it compress?

          The original size of your stuff sack is 16L, so you'd have to get something close to that. I can't tell how much it would compress, but don't expect THAT much more than your original stuff sack (unless your stuff sack doesn't compress the bag all that much).