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  • Outdoor Research - Ultralight Dry Sack - Alloy
  • Outdoor Research - Ultralight Dry Sack - Hydro

Outdoor Research Ultralight Dry Sack

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    • Alloy,55L
      sale $27.34
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    22 Reviews


    Ultralight Dry Sack

    Thanks to the lightweight polyester material and a wide range of sizes, the Outdoor Research Ultralight Dry Sack is ideal for backpacking in rain-soaked climates. The smooth profile easily inserts into a backpack while the fully taped seams and polyurethane coating ensure you'll have a dry pair of clothes to change into when you arrive at camp.

    • 40D polyester is durable, ultralight, and highly packable
    • Polyurethane coating and fully taped seams provide complete waterproof protection
    • Waterproof roll-top closure keeps the wet out
    • Durable buckle on the closure is quick and reliable
    • Single D-ring provides a secure attachment point
    • Item #ODR1064

    Tech Specs

    40D polyester, polyurethane coating
    1 L, 2.5 L, 3 L, 5 L, 10 L, 15 L, 20 L, 35 L, 55 L
    (1L) 5.25 x 5.5 in, (2.5L) 8 x 8 in, (3L) 9.25 x 9.25 in, (5L) 14.6 x 6 in, (10L) 17.1 x 7 in, (15L) 19.6 x 8 in, (20L) 20.5 x 9 in, (35L) 24.25 x 11 in, (55L) 26 x 13 in
    Claimed Weight
    (1L) .8 oz, (2.5L) .9 oz, (3L) 1 oz, (5L) 1.2 oz, (10L) 1.4 oz, (15L) 1.6 oz, (20L) 1.8 oz, (35L) 2.4 oz, (55L) 2.9 oz
    Recommended Use
    wet weather backpacking, river rafting
    Manufacturer Warranty

    Tech Specs

    • Reviews
    • Q & A

    What do you think about this product?

    Have questions about this product?

    Great Dry Sack

      I have the 15L and 20L and I use these dry sacks when I'm out in rainy weather. It's durable, especially for being lightweight, and easy to pack. All my gear was completely dry after spending days out in the rain, which is more than I can say for my friends who only used pack covers.

      Dryer, Lighter, and More Organized

        Dry sacks are an essential for any backpacker, whether you’re a newbie, or an experienced trekker, and weight matters. This sack is the perfect balance of strength, packability, lightness, and dryness. I had previously stuffed clothes, and other essential items in the bottom of my pack to get smashed, but those days are over.

        Not very strong

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

        I bought two of these in advance of a packrafting trip. The only thing I absolutely wanted 100% dry was my sleeping bag.

        The 5L looked like a nice tight fit for my 35 degree down bag, unfortunately, when stuffing it in the first time, I ripped the seal right off.

        I was a bit more careful about how I went about stuffing my sleeping bag the second time and have managed to pack it without destroying the dry sac since. Still, I'm wary of repeating this and treat it a bit more delicately than I would like.

        Does it keep things dry? Thankfully, I haven't had to find out yet. It does seem a bit too fragile, even for an ultralight sac.

        Hey Jacob, I bet that was a tight fit. When we make ultralight, we do give up some degree of durability. Nothing wrong with that, but it's just a tradeoff. A 10 L would have been a better choice, and perhaps wouldnt have had the same pressure put on it. Really sorry that happened. OR would be 100% happy to replace that for you! Please reach out to warranty at OR!

        OR Rep

        Great Dry Sack

        • Familiarity: I've used it several times

        This lightweight dry sack is great and holds a lot of gear and keeps it really dry. I packed a weeks worth of clothes in the 35L and some other gear for a trip to Costa Rica and I had some room to spare. Keeps all your gear dry in that humid climate and when you are not needing it it packs down super small to not take up that much room. If you are looking for a great lightweight option check this one out.

        Great Ultralight Dry Sack

        • Familiarity: I've used it several times

        These are very lightweight and due to that they are not the most durable nor are they the most waterproof. That is not the point of ultralight gear so that being said I love these for what they are. If you are looking for an ultralight dry stuff sack look no further.

        Great Ultralight Dry Sack

        Not all that waterproof

          The bag seemed to be airtight but not very waterproof. Used it to protect our camera bag while hiking in the rain. After a few hours of camping, we opened it up to check on our camera and the whole inside of the OR dry sack was moist. Our camera bag was moist as well. The camera did not suffer any damage, thankfully, but we lost confidence that it would keep our items dry.

          Any chance it was condensation? I've been using 4 of these bags for years with no issues. I've even used them to carry water, likely not their intended use at all, and not a drop leaked. The tape will eventually wear out after all the rolling, so keep that in mind.


          • Familiarity: I've used it several times

          I got the 2.5 litre size. I mostly put gear that I need to stay dry, in case of a downpour or leak in my pack cover. So far, it's done the job well. The clip is easy enough to handle with one hand. Also convenient size if you are at a campsite and need to bring a few things with you, but don't want to bring your entire bag/pannier.

          Keep Yo' Stuff Dry

            I have both the 5L and the 20L on this and have used both of them with no leaks or anything like that. These are not the thick dry sacks that can be fully submerged in water, but are the lighter weight material, but still have fully taped seems. An added bonus is that these dry sacks float pretty well when some air is left in them when you roll it closed.

            20 L Dry Sack

            • Familiarity: I've used it several times

            The 20 L is awesome. I love this size, I have several dry sacks. What I love about this one is that it fits perfectly into my small day bag and I can use it as a liner. It is almost the same size as my day bag and it keeps everything dry. If you want to size it down to a smaller size just roll down the top.
            Works great!

            Works as billed.

            • Familiarity: I've used it several times

            I knew we'd be backpacking in the rain. I also knew I wasn't always going to be carrying my gear as we had hired porters for our trek. So it was imperative to have a way to keep my clothes dry. We trekked. It rained (and snowed). And my clothes stayed dry thanks to this bag.

            Quality bag!

            • Familiarity: I've put it through the wringer

            My bag is 2.5 liters. It held my one long underwear, short wool underwear, a pair of gloves, long sleeve light wool shirt and my one extra pair of wool socks. Fantastic bag for me. I backpacked from Milan to Sarche Italy in rain and wet brush for 116 miles over a week long period. It kept my clothes dry. What more could I ask. Light/compact/dry : Quality. Now get this bag, smile and have a fantastic time :)

            So Very Dry

              None of my gear got wet on a recent rainy sailing trip. This is the sort of gear that you should always have on hand. When you need it, it's priceless. highly recommend for any outdoor gear arsenal.

              Best UL Dry-sac sold

              • Familiarity: I've used it several times

              I really like the bag compared to the sea-to-summit ultra sil bags. This feels better made, the top closure is a smoother material that will seal better, and the polyester is more slippery then the Sea-to-Summit making stuffing a sleeping bag easier. OR also has a fantastic warranty. None of these ultra light bags are ever totally waterproof, but I will update this review again once I get it in the rain. I don't anticipate any issues. The 10L weighed in at 1.4oz.

              Alexander - thank you for the great review on the UL stuff sack! Not many folks take the time to review something so "simple," but as you write above, there are some great details that the OR sack has that others don't.


              OR Rep

              Great deal

              • Familiarity: I've put it through the wringer

              I've used this bag a few times and it has held up well. I left it on the ground in a downpour and everything inside stayed completely dry. The bag is very light, so the exterior isn't as robust as a that of a heavier bag would be, but that's a sacrifice you make since this one is lightweight and not expensive. Great product.

              The bag is tougher than expected. On my last trip, I accidentally left a metal fork in the bottom and piled stuff in on top of it in preparation for a bear hang. Even though the prongs pressed hard against the bag overnight, it didn't tear. Not saying you should try it, but it may be good to know.

              Ultra-light is right!

              • Familiarity: I've used it several times

              Over the years I seem to have accumulated a number of down garments stuffed in their own sack pocket or stuff sack.Keeping all these pieces together can get to be chore.An ultralight dry sack is the perfect ticket.

              Great lightweight waterproof

              • Familiarity: I've put it through the wringer

              Outdoor Research makes awesome dry bags and dry sacks. The stitching and seams are great. This particular model is lightweight and won't take a ton of abuse being tossed and drug. If you need a more durable bag or sack that will see the outside of your bags etc, get one of the non-ultralight sacks or even the "durable" dry bag or sac. I use this for ensuring my down bag stays dry in case of emergency.

              Great lightweight waterproof

              Has anyone re-taped these? The seam tape on mine is getting "dried out"/flaking at the top. Maybe this is to be expected after 4+ years, but the bag material itself is fine so I'd like to salvage them. I emailed Outdoor Research but did not receive a response.

              Hiking Mark, I am sorry I did not see this sooner - I would expect a replacement from OR, but it sounds like they hadnt responded at the time you wrote this. Any movement here, or do I need to rattle a cage or two?


              OR Rep