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  • Sea To Summit - Ultra-Sil Dry Sack - Pacific
  • Sea To Summit - Ultra-Sil Dry Sack - Orange
  • Sea To Summit - Ultra-Sil Dry Sack - Lime

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  • Sea To Summit - Ultra-Sil Dry Sack - Pacific
  • Sea To Summit - Ultra-Sil Dry Sack - Orange
  • Sea To Summit - Ultra-Sil Dry Sack - Lime

Sea To Summit Ultra-Sil Dry Sack

$15.95 - $32.95

Free 2-Day shipping on orders over $50*

Select your style & size:

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  • Select options
    • Pacific, 35L
    • Pacific, 20L
    • Orange, 4L
    • Orange, 13l
    • Lime, 35L
    • Lime, 13L
    • Lime, 20L

    33 Reviews


    Wet trails don't have to mean wet gear.

    The Sea To Summit Ultra-Sil Dry Sack is made with with siliconized Cordura to make it incredibly light, durable, and waterproof. Bring it along when you're backpacking or climbing, when you need to protect your gear from wet weather without taking on additional weight. Translucent for easy packing and identification, the Ultra-Sil Dry Sack features a slippery finish so it slides easily into your backpack.
    • All seams are double-stictched and taped to prevent leakage
    • Non-wicking Hypalon roll-top closure includes sitffeners at the top for a better seal
    • Suitable to keep contents dry in wet situations, but submersion is not recommended
    • Item #STS0121

    Tech Specs

    Ultra-Sil (siliconized Cordura), PU coating
    1 L, 2 L, 4 L, 8 L, 13 L, 20 L, 35 L
    (width x height) [1L] 6 x 9 in, [2L] 8 x 12 in, [4L] 9 x 15 in, (diameter x height) [8L] 6.5 x 18 in, [13L] 8.5 x 21 in, [20L] 10 x 24 in, [35L] 12 x 27 in
    Hypalon waterproof roll-top
    yes, fully taped seams
    Backpack Straps
    Claimed Weight
    [1 L] 0.5 oz, [2 L] 0.7 oz, [4 L] 0.9 oz, [8 L] 1.1 oz, [13 L] 1.4 oz, [20 L] 1.7 oz, [35 L] 2.2 oz
    Recommended Use
    backpacking, rafting
    Manufacturer Warranty

    Tech Specs

    • Reviews
    • Q & A

    What do you think about this product?

    Have questions about this product?

    Light weight and waterproof!!

    • Familiarity: I've used it several times

    I just wanted something to protect some essential clothing and whatnot from the elements but did not want to add any weight to my pack. So far this dry sack has done its job! I'm very happy with how light weight it is as well!

    Perfect for backpacking

      These things are great to help organize any pack. Use them for food, or to keep wet clothes/towels separate in your backpack. They also make great additional storage, strap them to the outside if you have too much gear! Easy to find a use for any size.

      Dry bag

        I bought several of these bags to keep certain articles dry in addition to pack rain cover. You can use one inside a small pack to keep everything dry and place phone and other electronics inside small dry bag and placed inside large dry bag for added protection. Looks like they will wear good but don't allow bag to rub against anything hard or protruding object or will wear away protective layer. I now feel secure in the fact everything will be dry when I make it to camp.

        Works well for the price

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

        Great for canyoneering, backpacking and river trips. It's not exactly a burly bag but it gets the job done. When i go canyoneering i put my items that need to stay dry in the dry sack, and then put the dry sack inside of a backpack to keep it from getting damaged.

        Tore after a day of use

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

        I used an 8L for 5 day trip to pack some warmer gear. I loved it, but on the second day it just tore for no reason. Returning it sadly. I may need to just upgrade to the heavier duty sack sold by sea to summit. Really bummed this one crapped out so fast on me.

        Dry and Light

          This dry bag is truly dry. My first time using it, I attached it to the front of my paddleboard with my phone inside, and luckily, the truly stayed dry and kept my phone safe!

          A lot of dry bags seem to be really heavy and thick, and this one is light, without sacrificing quality and practicality.

          Versatile , Lightweight, and Effective

          • Familiarity: I've used it several times

          I have this dry sack in three different sizes and find all of them useful. I use the 1L for my phone (in a waterproof case), wallet, keys, medicine, etc. The 4L and 8L are good for keeping a first aid kit or an emergency set of clothing dry. The 20L fits perfectly inside my day pack as a liner. The combination of the 20L and as a liner and a pack cover kept the entire contents of my pack dry during a recent 3-hour downpour on the trail.

          Multiple uses.

          • Familiarity: I've put it through the wringer

          Excellent waterproof stuff sack for multiple uses to organize your gear and to keep it dry. Used 3 for the Bryce 100-all my gear, nutrition was dry and no dirt/dust. Yeah, would recommend! Even got some smaller ones for my work bag.

          Normally it should be wet....

          • Familiarity: I've put it through the wringer

          But when you need to keep it dry, buy one of these in every single size.

          I have three different sizes and have utilized every one of them and when my pack was dropped in the river early this season it was the only thing that kept my crucial gear dry.

          Thank goodness I "rigged to flip" or my trip would have been over early!

          Simple and effective

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

          My boyfriend and I took these on a recent canyoneering trip and they got the job done. We go the 20L which held a spare set of dry clothing, jackets, food and safety supplies with room to spare. When filled with air they double as a nice flotation device.


          • Familiarity: I've put it through the wringer

          I got the 2L and this thing is perfect for all my little things I take for camping that I want to keep dry and clean. Usually I throw my toothbrush, toothpaste, wallet, and keys in this thing and never have an issue.

          Par for the course UL Drybag.

          • Familiarity: I've put it through the wringer

          These UL drybags are never as durable or waterproof as the thicket PVC ones made for river use, but they get the job done for backpacking. I a couple of these for my Thru-hike of the AT and for a summer as a backcountry ranger on the East coast. I don't believe these are as durable as the Outdoor Research Ultralight Dry Bag and they are not quite as slippery. I also prefer Sealine's ultralight version to this, due to durability. I bought this bag because I needed a 1L bag, but I would prefer to buy Outdoor Research for the superior product and warranty. These bags will go a long time, but they do seem to lose their waterproofing faster than their competitors. I have had warranty issues with Sea to Summit in the past--with the company ignoring legitimate warranty claims.


          • Familiarity: I've used it several times

          These dry sacks are perfect for backpacking because they are very lightweight. It's easy to move things around while stuffing your gear in them. I wouldn't trust it submerged in water but the they'd hold up in the rain just fine.

          Waterproof and Lighweight

          • Familiarity: I've put it through the wringer

          Used this while I was living in Costa Rica. An essential item for the rainy season. Not only did it keep my stuff dry while hiking in the pouring rain, but it also let me take my laptop and school supplies to and from school. Walking in the pouring rain to and from school with an umbrella was dicey, but with the dry sack my computer stayed well intact and liquid free the entire semester.

          Does anyone have experience using these bags to try and keep liquid in? I am looking for something to keep sweaty clothes sectioned off after hot yoga classes.

          Unanswered Question

          I'm thinking of creating my own backpack with stuff sacks. I would like to use a 20 liter for the main body, and then use two smaller ones for the smaller gear. I need to have lightweight, durable and as waterproof as possible. Any suggestions?



          Unanswered Question

          What size would work best for a XL Mountain Hardwear Kelvinator down jacket w/hood? I don't like the built in one w/zipper so need something else. thanks, Rob

          Would this work well as a bear bag?

          Would this work well as a bear bag?

          Can you tell me if the 2L and 4L have round...

          Can you tell me if the 2L and 4L have round bottoms?

          I want to get one of these. Which size...

          I want to get one of these. Which size would best fit a kelty cosmic 20 degree down bag? Thanks!

          Best Answer

          I'd go for the 8L to be on the safe side. If the sleeping bag compresses smaller than 8L you can always roll the excess dry-sack material up into the top. I use a 20L model to carry my 40 degree bag, sleeping pad, base layers, insulating layer, beanie, and gloves, and I still have a little extra room in the top, and it still fits horizontal across the bottom of my 80L backpack.