• Sea To Summit - Ultra-Sil eVent Compression Dry Sack - Grey
    Sea To Summit - Ultra-Sil eVent Compression Dry Sack - Grey
    Sea To Summit - Ultra-Sil eVent Compression Dry Sack - Grey
    Sea To Summit - Ultra-Sil eVent Compression Dry Sack - Grey
  • Sea To Summit - Ultra-Sil eVent Compression Dry Sack - Grey
  • Sea To Summit - Ultra-Sil eVent Compression Dry Sack - Grey
  • Sea To Summit - Ultra-Sil eVent Compression Dry Sack - Grey
  • Sea To Summit - Ultra-Sil eVent Compression Dry Sack - Grey
  • Sea To Summit - Ultra-Sil eVent Compression Dry Sack - Grey
  • Sea To Summit - Ultra-Sil eVent Compression Dry Sack - Grey
Sea To Summit - Ultra-Sil eVent Compression Dry SackView Larger Image

Sea To Summit Ultra-Sil eVent Compression Dry Sack

$29.95 - $52.95 $52.95

Select style & size:

Select options
  • Select options
    • Grey, XXS/3.3L
      sale $29.95
    • Grey, XS/6L
    • Grey, S/10L
      sale $39.95
    • Grey, M/14L
    • Grey, L/20L

    Tech Specs

    [membrane/laminate] eVent, [shell] 30D Ultra-Sil nylon, [straps] Cordura
    [XXS] 1.3 - 3.3 L, [XS] 2 - 6 L, [S] 3.3 - 10 L, [M] 4.5 - 14 L, [L] 6.7 - 20 L
    Hypalon waterproof roll-top
    [XXS] 5 x 10 in, [XS] 6 x 14 in, [S] 7 x 16 in, [M] 8 x 18 in, [L] 9 x 20 in
    Claimed Weight:
    [XXS] 2 oz, [XS] 2.3 oz, [S] 2.6 oz, [M] 3.2 oz, [L] 3.4 oz
    Recommended Use:
    backpacking, hiking & camping, paddling
    Manufacturer Warranty:

    Ultralight, durable, waterproof protection.

    The Sea To Summit Ultra-Sil eVent Compression Dry Sack compresses gear like dry suits or sleeping bags to one-third of their volume while keeping them dry thanks to the eVent waterproof membrane. Ultra-Sil nylon keeps this sack remarkably light for how strong it is, and the Hypalon closure makes sure your gear doesn't slip out. The three Cordura straps shrink everything with ease so you can hop down the trail knowing that you didn't sacrifice any space in your pack.

    • eVent waterproof membrane
    • Ultra-Sil nylon shell
    • Cordura straps
    • Hypalon closure
    • Three compression straps

    Pack Less, Size Down

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

    Great quality, straps compress the bag easily, and worth the purchase. Only mistake I made? Going for the large/20L. For a 3-day trip, it was more than enough. Should have gone with the medium/14L at most.

    Would have worked had I kept everything in there - insulated jacket, rainwear, etc. - but you'll always want those important pieces readily available.

    Does the Job

    • Familiarity: I've put it through the wringer

    No more sitting on the sleeping bag to get all the excess air out before it gets packed up. All you have to do is pull on the compression straps and the bag gets nice and compacted.

    Works as it should

      I picked this up for a Western Mountaineering Alpinlite bag. The bag fits fine, compresses well, and there’s no issues for what I need it to do.

      Hi Kris-
      What size dry bag did you get for the Alpinlite? Thanks.

      Initial impressions are good

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

      I ordered both a medium and large bag (14L and 20L) mainly as a tester for compressing sleeping bags for my family and myself on backpacking and camping trips.

      My sleeping bag is a mummy style and pretty large as it fits my 6'2'' and 265lbs frame. It is also about 20 years old so not as high tech as today's offerings. Which means it's heavier and bulky compared to a current 3 season bag.

      I use 3 season as a rating because when I bought it 20+ yrs ago that was how they were rated them as best as I recal. As a guide I have slept in temps down to about 45F and been warm enough if that helps with a comparison to today's sleeping bags.

      Anyway, the compression sacks straight out of the box seem pretty decent, they are very lightweight and the eVent system works pretty well indeed. With nothing in the sacks I sealed them and squeezed out the air, just to test things. It was much easier to squeeze than I suspected it would be.

      The attached pictures show my sleeping bag, the compression sack and a standard Nalgene bottle for scale.

      I squeezed my sleeping bag into the Large (20L) sack and it was a struggle, I think I need the next size up to fit it properly but it did compress down a fair bit and it was pretty easy compressing it using the straps.

      As long as you are a standard size and/or don't have a very cold temp rating on the sleeping bag the large (20L) compression sack should fit your bag.

      I haven't tested it's waterproof capability so can't comment on that but will say that I have dry sacks I use for kayaking that are waterproof but are much, much heavier than this compression sack and for my intended use of compressing my sleeping bag to carry in a backpack it certainly looks like it will keep my sleeping bag compressed and dry so I can now dispense with my kayaking dry bags for these compression sacks.

      I rated the bags as 4 star as I have yet to test them for being waterproof or see how they hold up to repeated use in the field, when I have that data I will come back and update the rating.

      Finally, thanks to my gearhead Nicky Rosado for help and guidance along the way to the purchase, I do like the fact that Backcountry has gearheads to ask questions, a big thumbs up in my mind.

      Initial impressions are good

      Light compression

        This little bag works great and is super waterproof. Mostly use it for clothes to keep everything compressed small at a lighter weight. Works great!

        Lightweight & Holds Gear

          I’m adding to my collection (more sizes) of these bags. Light weight, waterproof and a compression solution for getting precious space back from your sleeping bag and clothing. With the ultra sil construction, recognize this light weight material gives up something in the abrasion and durability categories. But I’m not using these as the only line of defense against water—they are generally in another bag (pack, larger dry bag etc) but work great to compact the goods inside. And, for river trips with down products, I have some extra security in knowing my down sleeping bag is in a couple layers of water proof protection.

          Light Weight and Tough

          • Familiarity: I've put it through the wringer

          First trip out of the package was a two and a half week medical teams trip all over Nepal (in February). This bag packed my 0 degree down bag with SOL bivy inside. It was a super tight fit; however, it never tore or ripped and kept everything dry as well! Great product!

          --Patrick Bancke
          Portland, OR

          Nice and light

            This is a light little bag, and compresses nicely. I use the XXS size to carry a days worth of food for day long hikes. I've only used it for 3 hikes, and it shows no sign of wear.


              I got this is a size large for a Western Mountaineering puma GWS bag. The bag fits and the sack keeps water out! Compacts my massive bag to a manageable size

              Decent compression sack

                I purchased this ultra-sil dry compression sack to use with my down sleeping bag. However, after examining the bag a little closer, I only use it for clothes and other small items now. Where this is a nice ultralight sack, it just isn't as durable as the original event dry sack. The original version has an additional compression strap, with much thicker and more durable materials. Unless you really need to shed a few ounces, I would go with the original version.


                • Familiarity: I've used it several times

                Simply great... have several of these and they´re really well made ... light and waterproof . Once i was totally soaked during a river crossing and my down sleeping bag inside one of these kept 100 % dry as expected. 5 stars for me...


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

                The Large compresses my Nemo Verve long sleeping bag enough to cram it into my osprey Volt 60.

                Even Better

                • Familiarity: I've put it through the wringer

                If you backpack a lot, and haven't been using these eVent compression sacks, you're seriously missing out.
                Beyond keeping gear dry, and compact in your pack, this thing can double as a water-proof bear bag.
                Its also the best pillow solution i've found on the trail. Don't buy a pillow, just stuff this sucker full of all your clothes, and you're stoked.
                The ultra-sil version is noticeably lighter than the standard eVent version.

                Tougher than the rest

                • Familiarity: I've put it through the wringer

                I've had ultralight compression sacks in the past and typically they don't hold up. Seems split, straps tear, and they end up in the trash. These are exceptionally well built. Mine was crammed into my saddle bag on a 6,700 mile motorcycle trip and returned with no wear after a month of use. I purchased the Small size for my WM Versalite 5'6

                One short One strap short

                  I got the event compression dry sack to replace my old sack. It works great keeping my sleeping bag dry but it will not compress as small because it only has three compression straps. If it had four straps it would be five stars.