Last updated at 07/05/2026 13:52:14
Sea To Summit Ultra-Sil Dry Sack 35L / Green
Delivery $25.14
Ultra-Sil Dry Sack
Delivery $9.95
originally posted on REI
The way Sea to Summit packages these makes them more susceptible to failure.I purchased an 8L and a 20L today. They both have a plastic strip across the top to assist with rolling and closing of the bag. When testing their fitment for an upcoming trip, I was having an issue packing the 8L. In trying to flatten out this plastic piece, it snapped inside, and created a sharp corner that will only wear away the bag from the inside.I then examined the 20L, and I see that the plastic strip inside of that one is already stressed from being folded so that Sea to Summit could save on packaging.
originally posted on REI
When not damaged, will keep contents dry. I’ve purchased four of these (varying sizes) over the years. One aspect of product design that is lacking is sewing the large tag on the inside of the bag, not using tags that tear free (without scissors) and asking the user to cut the tag free. I’m always careful, but with this most recent bag the thin fabric folded over on itself and was cut with the scissors. REI won’t replace due to use/abuse — which I get — but better product design could prevent issues like this.
originally posted on REI
These bags are perfect for keeping gear dry and protected from the elements. I use this size not only for backpacking but I put my phone and similar items in it at the beach to keep them more protected. Maybe not its usual purpose but effective. Not totally waterproof if your gear goes overboard but plenty useful against light rain and spills. Buckle seems light but I haven’t had any problems with it yet. For me, this bag does exactly what it claims.
| Volume | 35 liters |
| Ultra-Sil 30D | siliconised high-tenacity Cordura nylon fabric |
| Waterhead | 2.000 mm |
| Material characteristics | waterproof |
Sea To Summit Ultra-Sil Dry Sack 35L / Green
Delivery $25.14
Ultra-Sil Dry Sack
Delivery $9.95
The way Sea to Summit packages these makes them more susceptible to failure.I purchased an 8L and a 20L today. They both have a plastic strip across the top to assist with rolling and closing of the bag. When testing their fitment for an upcoming trip, I was having an issue packing the 8L. In trying to flatten out this plastic piece, it snapped inside, and created a sharp corner that will only wear away the bag from the inside.I then examined the 20L, and I see that the plastic strip inside of that one is already stressed from being folded so that Sea to Summit could save on packaging.
When not damaged, will keep contents dry. I’ve purchased four of these (varying sizes) over the years. One aspect of product design that is lacking is sewing the large tag on the inside of the bag, not using tags that tear free (without scissors) and asking the user to cut the tag free. I’m always careful, but with this most recent bag the thin fabric folded over on itself and was cut with the scissors. REI won’t replace due to use/abuse — which I get — but better product design could prevent issues like this.
These bags are perfect for keeping gear dry and protected from the elements. I use this size not only for backpacking but I put my phone and similar items in it at the beach to keep them more protected. Maybe not its usual purpose but effective. Not totally waterproof if your gear goes overboard but plenty useful against light rain and spills. Buckle seems light but I haven’t had any problems with it yet. For me, this bag does exactly what it claims.
HEADS UP - this isn't the kindest review courtesy of my lack of sleep. I hope this comes as helpful critique that ensures the future implementation of customer design is the highest quality possible but I'm sure with my current position and short fuse this is going to be a rough read.After 6 nights on this pad I hate this product and cannot stand to take it on the AT or any future adventure. I know y'all put great effort into the engineering but by God this is the worst mat I've ever slept on. I prefer to sleep on the tent floor.The sheer noise it makes was enough to have woken up my fellow campers and the lack of traction on it creates such an uncomfortable balancing act just to stay onboard the mat I felt I was riding a lubed up surfboard on a gliding magic ... MoreHEADS UP - this isn't the kindest review courtesy of my lack of sleep. I hope this comes as helpful critique that ensures the future implementation of customer design is the highest quality possible but I'm sure with my current position and short fuse this is going to be a rough read.After 6 nights on this pad I hate this product and cannot stand to take it on the AT or any future adventure. I know y'all put great effort into the engineering but by God this is the worst mat I've ever slept on. I prefer to sleep on the tent floor.The sheer noise it makes was enough to have woken up my fellow campers and the lack of traction on it creates such an uncomfortable balancing act just to stay onboard the mat I felt I was riding a lubed up surfboard on a gliding magic carpet underneath me (Not the best analogy but bear with me and my lack of any sleep).Suggestions: (a) either impose a full coat of more traction holding fabric along the entire surface or (b) patches/lines of far more tractive force creating material in a pattern throughout the pad.All in all, I regret buying this twice for my wife & I - we both desperately want to return these things but have passed your 60 day return policy as we ordered it while abroad and the biggest regret I have is having to now deal with reselling it on FB Marketplace.I apologize for the rant but it is an honest review and again, I hope it helps with future designs.
I've used various types of Sea to Summit dry bags (various thickness of material, regular dry bags vs eVent + eVent compression bags) for years, and have never had a problem. When gearing up for a recent backcountry kayaking trip, I decided to replace several of my dry bags with new ones; I've not had any issues with my older bags but they've seen heavy use so I figured it was time to retire them. I saw that the new Sea to Summit bags come with replaceable buckles, but didn't think much of it; I've never had to replace a buckle on my existing drybags. I'm not so sure now that the replaceable buckle is a good idea. Twice in the span of a 5 day trip a screw ended up coming loose, causing the buckle to fall off of the dry bag. Obviously this renders the dry bag ... MoreI've used various types of Sea to Summit dry bags (various thickness of material, regular dry bags vs eVent + eVent compression bags) for years, and have never had a problem. When gearing up for a recent backcountry kayaking trip, I decided to replace several of my dry bags with new ones; I've not had any issues with my older bags but they've seen heavy use so I figured it was time to retire them. I saw that the new Sea to Summit bags come with replaceable buckles, but didn't think much of it; I've never had to replace a buckle on my existing drybags. I'm not so sure now that the replaceable buckle is a good idea. Twice in the span of a 5 day trip a screw ended up coming loose, causing the buckle to fall off of the dry bag. Obviously this renders the dry bag useless, as it can't hold out water if it can't seal. This happened to 2 different drybags, so it didn't seem like I got just one dud. Thankfully both times the screws fell out in the tent and I was able to find them; had they fallen out on the beach I'd be out of luck. I was also thinking that, as the dry bags themselves don't come with a replacement buckle, having a replaceable buckle will only help you out if you've bought a spare and brought it along with you. So most people are likely replacing buckles at home and not in the field.The bags themselves performed admirably as always, with only the new buckle design being a drawback. However, it's a potentially a pretty big drawback.
These bags sound like a great idea. They are supposed to keep gear dry and compartmentalized. We just finished hiking the Appalachian Trail and this piece of gear was our number one regret. We didn't expect our gear to stay dry if these bags were submersed in a pool. Fair enough. But our gear didn't even stay dry in the rain. Not just the rain, our gear was wet on the inside if the air was humid! I don't understand where the dry part of these dry sacks comes into play. Moisture just saturated through the fabric. Halfway through our hike, my family of 6 tossed $500+ worth of dry sacks and replaced them with Great Value gallon freezer bags! Just stick with the Ziplocs. You'll thank me later.
Generally I've had good experience with STS gear. I have an number of their ultrasil stuff sacks, which have performed as expected. One recent issue was a screw came loose on the newer sack that touts a "field replaceable" buckle. Great concept but a screw fell out of my 2L dry sack buckle and was lost on the first night of a 7 day trip. There was no misstreatment or heavy use, opening and closing once or twice a day and kept in my pack for the majority of the day. I checked my other dry sacks and screws were loose on 2 other dry sacks. Thankfully, I did not encounter conditions where the fully sealed bag was essential. For the price of these dry sacks STS should include extra screws with them. I gave this 2 stars since a dry sack that can't close isn't a dry sack.
My husband and I are currently in the midst of a multi week backpack trip on the coast of England, where we’ve had some significant rain and heavily dewey nights. We’re using three ultra-sil dry bags inside of our backpacks to keep everything nice and dry. These bags are indispensable. They’re very light weight. The fabric is nice and smooth, allowing you to slip them in and out if your backpack very easily. We’ve used them for about a month and they still look just like new!
*Updated review* I recently purchased a few USDSs for a multiday trip to Yosemite. On the second night a screw fell out of the buckle and was lost making the sack useless. I checked the other USDSs I had and there were loose screws on at least one other bag. As a result I originally posted a 2 star review. After interacting with S2S customer service, I'm reposting as a 4 star review (5 stars is reserved for highly functional produces with no issues). S2S customer service knocked this out of the park. The were aware of the issue, noted a fix was in place and sent me not one but several replacement buckles; no hassle whatsoever. I don't recall any company confirming there's an issue with a product. Honesty and integrity along with high quality gear gets my brand ... More*Updated review* I recently purchased a few USDSs for a multiday trip to Yosemite. On the second night a screw fell out of the buckle and was lost making the sack useless. I checked the other USDSs I had and there were loose screws on at least one other bag. As a result I originally posted a 2 star review. After interacting with S2S customer service, I'm reposting as a 4 star review (5 stars is reserved for highly functional produces with no issues). S2S customer service knocked this out of the park. The were aware of the issue, noted a fix was in place and sent me not one but several replacement buckles; no hassle whatsoever. I don't recall any company confirming there's an issue with a product. Honesty and integrity along with high quality gear gets my brand loyalty everytime. Well done S2S!p.s. unfortunately I can't find my original review so ignore my 2 star review if you come across it.
These bags are very versatile. I’m not a camper nor a hiker. I bought them to stow wet/dirty laundry when traveling. Recently I was very thrilled to use the 5 liter bag to transport ice packs and cold beverages for a school field trip. It’s not meant to keep the items cold but it prevented the “sweat” from getting the other items I was carrying in my backpack from getting wet. These would be great for a day at the beach or the pool. If you want to have items safe from a drop in the water, you must be sure to roll down the top at least three times, squeezing out the air as you go and then secure the buckle. I bought several for family members as well because I was so pleased with the bags I bought. For me, the 8L is a better size for my post vacation dirty laundry.
| Volume | 35 liters |
| Ultra-Sil 30D | siliconised high-tenacity Cordura nylon fabric |
| Waterhead | 2.000 mm |
| Material characteristics | waterproof |
Made of siliconized Cordura, Ultra-Sil dry sacks are 50% lighter than standard dry bags of the same size. These bags are ideal for backpackers, who need to keep their gear organized and dry. The featherweight fabric is not recommended for kayakers and canoeists. Made of polyurethane-coated siliconized Cordura nylon for ultimate waterproofing. Nonwicking Hypalon roll-top closure with stiffener at the top for a better seal. Nearly transparent for good visibility of contents. All seams are double stitched and tape sealed. Uses nonbulky low-profile buckles. Soft and flexible with a slippery finish for easy packing. Round bottom.
Made of siliconized Cordura, Ultra-Sil dry sacks are 50% lighter than standard dry bags of the same size. These bags are ideal for backpackers, who need to keep their gear organized and dry. The featherweight fabric is not recommended for kayakers and canoeists. Made of polyurethane-coated siliconized Cordura nylon for ultimate waterproofing. Nonwicking Hypalon roll-top closure with stiffener at the top for a better seal. Nearly transparent for good visibility of contents. All seams are double stitched and tape sealed. Uses nonbulky low-profile buckles. Soft and flexible with a slippery finish for easy packing. Round bottom.
in 2 offers
last seen 7 May 2026
The lowest price we last saw for Sea to Summit Ultra-Sil Dry Sack-Green-35 Litres was $33.00 at wildholics 戶外露營用品店, compared across 2 retailers (last seen 7 May 2026). Prices may have changed since.
The all-time low we recorded was $33.00 on 12 Feb 2026.
Prices last updated 7 May 2026.
Sea to Summit Ultra-Sil Dry Sack-Green-35 Litres
Made of siliconized Cordura, Ultra-Sil dry sacks are 50% lighter than standard dry bags of the same size. These bags are ideal for backpackers, who need to keep their gear organized and dry. The featherweight fabric is not recommended for kayakers and canoeists. Made of polyurethane-coated siliconized Cordura nylon for ultimate waterproofing. Nonwicking Hypalon roll-top closure with stiffener at the top for a better seal. Nearly transparent for good visibility of contents. All seams are double stitched and tape sealed. Uses nonbulky low-profile buckles. Soft and flexible with a slippery finish for easy packing. Round bottom.
Made of siliconized Cordura, Ultra-Sil dry sacks are 50% lighter than standard dry bags of the same size. These bags are ideal for backpackers, who need to keep their gear organized and dry. The featherweight fabric is not recommended for kayakers and canoeists. Made of polyurethane-coated siliconized Cordura nylon for ultimate waterproofing. Nonwicking Hypalon roll-top closure with stiffener at the top for a better seal. Nearly transparent for good visibility of contents. All seams are double stitched and tape sealed. Uses nonbulky low-profile buckles. Soft and flexible with a slippery finish for easy packing. Round bottom.
