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Details

  • Siliconized on the outside, tough Cordura® nylon is weatherproof, lightweight and durable for hiking and backpacking in wet conditions
  • Polyurethane coating on the inside permits the fabric to be seam taped; waterproof seams are double-stitched and factory-taped for added weather protection
  • Hypalon® watertight roll-top closure keeps contents secure and protected; fold the Hypalon strip down first and make at least 3 rolls before closing the buckle
  • Roll-top fabric sacks are not intended for complete submersion; sensitive electronic devices should be double-bagged or packed in a waterproof hard case for maximum protection
  • Ultra-Sil sacks are designed for use inside a backpack and are not suitable for boating
  • Comes in assorted colors only; sorry, specific color requests cannot be accommodated

Imported.

View all Sea to Summit Roll-Top Stuff Sacks

REI membership

Specs

Best Use Backpacking
Gear Capacity (L)
2 liter
2 liter
4 liter
4 liter
8 liter
8 liter
13 liter
13 liter
20 liter
20 liter
35 liter
35 liter
None
0 liter
Gear Capacity (cu. in.)
2 liter
122 cubic inches
4 liter
244 cubic inches
8 liter
488 cubic inches
13 liter
793 cubic inches
20 liter
1220 cubic inches
35 liter
2135 cubic inches
None
NA cubic inches
Closure Roll-top
Waterproof Yes
Material(s) Silconized nylon
Dimensions
2 liter
8x9 inches
4 liter
9x15 inches
8 liter
6.5x18 inches
13 liter
8.5x21 inches
20 liter
10x24 inches
35 liter
12 x 27 inches
None
NA
Weight
2 liter
0.8 ounces
4 liter
0.9 ounces
8 liter
1.1 ounces
13 liter
1.4 ounces
20 liter
1.8 ounces
35 liter
2.2 ounces
None
NA ounces
Rated 5 out of 5 by from Torrential downpours, no problem! This bag held up to a torrential downpour! My wife and I went on a motorcycle trip across country. We realized half way through that we needed more storage space for clothes so we went to REI to get a dry sack to strap down exposed to the elements. On the way back we were forced to ride through a monsoon of a storm. The kind where cars were pulled off the side of the highway because they couldn't see! We were in it regardless with no overpasses to hide under and decided to ride slowly. The contents of this bag were bone dry when we finally stopped at our destination while literally everything else that was supposed to be waterproof, was soaking wet.
Date published: 2016-07-13
Rated 5 out of 5 by from Great Lightweight bag This is a great product from sea to summit. Understand that these are NOT submersable bags and if you submerse them they will not keep your stuff dry. That being said, I store my papers (drivers liscense, pass port, cell phone, gps, etc) in this bag in the brain of my pack and it performs without a hitch. My cards did put a small tear in the side of the bag but a little seam grip fixed it right up. With lightweight gear, you are paying for leight weight not for durability. If you want something to sit in the bottom a raft, get the heavier vinyl or heavy rip stop, you're on a boat weight doesnt matter.
Date published: 2012-10-07
Rated 2 out of 5 by from Good for about a year, delicate use only I have several of these bags in different sizes. I use them for medical kits, clothes and essential items that must be kept dry while hiking, backpacking and camping. I have exposed the bags to rain repeatedly, submerged them in a backpack for short periods during river crossings. The packaging warns that they are not meant to be submerged. The good: incredibly light product, easy to use. Waterproof qualities were good against rain and submersion. The bad: Waterproofing qualities went away after about a year. Items in dry bags in my backpack got wet in rain. The tape at the bottom of the bag delaminated and pulled away from the fabric. Bottom line: If you can afford to replace your gear often, these are great. I prefer somthing that lasts longer. I would not buy them again.
Date published: 2013-01-11
Rated 1 out of 5 by from Not rain proof I don't understand how these sacks can be called waterproof if they can't keep stuff dry in the rain. Was using one of these as my food bag. It was hug up on a bear cable overnight in the rain. Not a storm or driving rain, simply a basic rain that lasted for a few hours. Fortunately I pack my food inside zip lock bags because when I retreaved the bag in the morning, everything inside was wet. I can understand the warning that these bags shouldn't be used for submersion because then you have water pressure trying to push watering into the bag. But I don't see calling it a waterproof bag if it can't keep things dry from the rain.
Date published: 2017-01-30
Rated 3 out of 5 by from Not totally waterproof I bought this bag as a lightweight bear bag, hung on a bear pole every night, for backpacking. It did great for that use. We experienced lots of rain and this bag kept our stuff dry. HOWEVER, I then used it on a white water rafting trip and although I folded the top over carefully 4 times, EVERYTHING in the bag got soaked. The bag sat on the bottom of the raft in 1-3" of water (as rafts are wont to accumulate in white water), and just soaked it up. Very embarassing as several boat-mates had put their lunches in my awesome lightweight DRY bag!! Great for backpacking. Terrible for rafting. Tip: test your bag at home in a sink or tub before using it.
Date published: 2011-08-07
Rated 4 out of 5 by from Excellent tool These have been great bags for the last 4 or 5 years. I've only had to replace one due to loss, not because of product failure. They are made of Silnylon, and are not robust, but light, and effective for the intended purpose. I use them to protect my down, and extra layers from getting soaked through, vs using a stuff sack for a little extra protection. If you are not familiar with taking care of lightweight backpacking gear, realize water can penetrate silnylon as it wears down especially if it's abused. If you are not willing to take care of it or give it a little babying like you would any UL gear it, will not last. For rafting and kayaking I use more robust or "real" dry bags. For backpacking where I just need a protection from a downpour, condensation in my pack, or to be able to set my gear down under my tarp while I set up the tarp/bivy, I'll use these.
Date published: 2014-05-15
Rated 4 out of 5 by from Great waterproof food sack Bought a couple of these sacks to use as food hangers for overnight trips. They worked great at keeping the contents dry while hung in an open clearing in the rain all night, for multiple nights. The closure mechanism even forms its own loop for hanging or clipping onto a rope. Added almost no weight to my pack. The only real downside is that it's hard to get air out of them for packing away. Being watertight also means not breathable fabric. You have to squeeze from the bottom up to the closure, so there's always some wasted space.
Date published: 2013-09-19
Rated 5 out of 5 by from great pack liners I have two of each size (plus a 1L) of these siliconized dry bags. My husband and I have used them many times for multiple-night backpacking trips and canoeing in the Boundary Waters. We use them as pack liners inside our backpacks or portage packs - we think they're great - lightweight and easy-to-pack. We try to pack them so that anything hard is packed in the middle of the pack so it won't poke the fabric - we do have some abrasion spots/scuffing where something hard or pointy has rubbed against the sides, but so far, all of the bags are air-tight and sound. I can get most of the air out of the bags by loosely folding the top over, smooshing the air out with my weight, and then rolling up the closure - the trickiest part is making sure the contents don't get carried up into the roll. The 35L bags will hold two regular-length REI Trekker sleeping pads or our synthetic-fill sleeping bags + liners (in lightweight compression bags). We use either the 20L or 13L bags for our clothes/personal bags (depending on the season/length of trip) and the 8L bags for our fleece/insulated jackets. The 4L holds my binoculars or a light-weight first aid kit and we use the 1L for my husband's compact camera/batteries/SD cards (splash-proofing). We did get a small hole in his camera bag, but that's because it got caught in his waist pack zipper. We patched it with some lightweight "duct" tape (on the inside) and it's been fine. I wouldn't expect these bags to be 100% waterproof, certainly not in a submersed situation, and definitely not for waterproofing electronics – but they work great with canvas portage packs in a puddly canoe and they keep fabric-items dry if the gear bag takes a quick dunk into the lake or it rains cats-and-dogs while backpacking. Another plus: they're easy to clean - I usually give them a good swish-rinse after every trip to get rid of any smokey-funky camp smell - good as new! We never put our tent into a drybag (with our luck, it's wet half the time anyway) and we use heavier dry bags when kayak camping. If you're looking for lightweight pack liners, these are great and we haven't had any trouble with durability.
Date published: 2013-12-06
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What size of dry sack for Kelty -20 Sleeping bag?

Asked by: idpashooter
The 20 liter will work for a -20º sleeping bag.
Answered by: REIservice
Date published: 2016-07-12

I am interested in purchasing a 4 liter Ultra-Sil dry sack and am wondering does the 4 liter sack come with the flat bottom as shown in the photo?

Asked by: MtWildman
Yes.
Answered by: REIservice
Date published: 2015-09-20

I'm looking for a dry sack to hang food in a tree when backpacking.  Do you think this sack is durable enough to be pulled up into trees?

Asked by: Madjik Man
The Ultra-Sil Dry Sack can certainly be used to hang food from a tree. That said, the materials are very lightweight. The regular Sea to Summit Lightweight Dry Sack would be a more durable option. http://www.rei.com/product/883362/sea-to-summit-lightweight-dry-sack-13-liters
Answered by: REIservice
Date published: 2015-09-20
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