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For when dry matters as much as lightweight.

Keep your on-trail, on-deck, and on-board wares protected from the elements with the Sea to Summit Ultra-Sil Nano Dry Sack. Weighing scantly an ounce, this waterproof barrier might be silly light, but when it comes to repelling water and standing up to Mother Nature's wrath, it's über-serious.

  • Lightweight, durable nano sil nylon keeps your items bone dry without weighing your pack down
  • Hypalon waterproof roll-top closure seals out moisture for worry-free traveling and trekking
  • Fully taped seams prevent water from sneaking in through the fabric joints
  • A variety of size options let you dial in the perfect fit for the gear you want to quarantine
  • Only intended for use inside a pack or bag; not designed for paddlesports

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Sea To Summit Ultra-Sil Nano Dry Sack

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Here's what others have to say...

5 5

Great bags

  • Familiarity: I've put it through the wringer

I almost returned these bags because they felt so thin and cheap. After three kayak-trips, I'm buying more. They are super light-weight and stronger then they look. They took several dunkings and never leaked.

4 5

Keeps my junk dry

  • Familiarity: I've put it through the wringer

I bought a 2L and an 8L in these and they work great! Ive used them for kayaking, hiking, and I even put my valuables in them when it rained at the beach. They're so lightweight compared to my other dry bags (which are the ones you buy at Walmart so I guess that's not saying much). I use these for the important junk I really need to keep dry. Unfortunately my 2L somehow got holes in the bottom after about 5 months of wear and tear, but my 8L is still going strong and doing what it was made for! Keeping junk dry!

4 5


  • Familiarity: I've used it several times

I've had the 2L size for a few years, usually used to keep small stuff (wallet/phone/sunglasses/etc) dry while on small boats. It works for the most part, but if you fill it with water to check waterproofness, it'll leak in a half dozen spots (not on the seams); not a strong streaming leak mind you, but just slow dripping in spots. As such, I wouldn't really consider it a true dry bag that'll keep your stuff 100% dry if you threw it in a tub/pool/lake/ocean/etc for a period of time, but outside of that, it's great. (FWIW - I've switched to using a small Pelican case instead)

I also got a small 1-2mm hole in it as well, despite never putting anything particularly pointy/sharp in it, nor have I been particularly rough with it. I suppose something sharp could've brushed up against it, but at least I know the ripstop works. It wasn't noticeable until I test-filled it with water after a few trips.

5 5

Waterproof inside and out

  • Familiarity: I've put it through the wringer

I use this for two purposes: 1) As a wash bag for clothes when I travel and laundry service/laundromat are not available, 2) As a backpacking/hiking waterproof bag for electronics (phone).

The material feels a bit delicate, as it is see-through thin, and if given enough abuse, I wouldn't be surprised if it ripped or punctured. However, you would need to try in order to damage the bag beyond normal usage.

For all uses so far, it keeps water out, or for my example described above, keeps water in.

Highly recommended.

5 5

These things rule.

  • Familiarity: I've put it through the wringer

Use them fishing, beaching, MTB biking, hiking, canoeing, camping. Not responsible enough to keep sand and sea off my electronics without it.

5 5


  • Familiarity: I've put it through the wringer

This stuff sack is super light and keeps all my clothes for my trips completely dry. I have one in 8L and one in 13L. These are surprisingly durable for how thin they are!

5 5

A Great Product!

  • Familiarity: I've used it several times

I have used these stuff sacks in both backpacking and backcountry skiing for two years. My wife and I have about five each and we are very happy with them. They are waterproof and weigh about a quarter of what the stuff sacks they replaced did.

How do these bags hold up over time?

How do these bags hold up over time?

Responded on

While I don't own this item [yet], I do have some experience with the material.
Keep it in your pack and don't put anything sharp-and-pointy in it and it should last forever.
If you need a bag that can be exposed to rocks and brush, or one that you can drop down a scree hill, then get something a little heavier :-)

5 5


  • Gender: Female
  • Familiarity: I've used it several times

I love these bags, it's my 2nd one, compacts down small, color is cute and very handy for electronics, snacks and more.

What size would I need for an adult mummy...

What size would I need for an adult mummy bag and smaller kids bag?
What about one for about a 3-day supply of clothes (summer hike - two pair convertible pants, 2 or 3 light weight shirts, 2 socks, one short, emergency light gloves/hat).


Responded on

I use a 20L to carry a highly compressed sleeping bag, pad, thermal base layers, and a few other misc items, with plenty of room to spare, so I think the 20L could handle your two sleeping bags and some clothes. You could go for the 35L to be on the safe side - if you don't fill it up, the extra material rolls up into the top so it shouldn't take up too much extra room.