S1 Dry Flush Sealing ToiletPush a button.
Never see it again.
$1,500.00USD · taxes calculated at checkout
A sealing toilet that only seals what it has to. Every #2 gets heat-sealed in its own bag. #1 goes to a separate bottle. No black tank, no dump station, no composting.
★ 4.7 from S1 owners · “Coming from the black tank work, this is a much easier and cleaner option for boondocking.”
- Never see, touch or smell your #2s
- Only #2s get sealed. Urine goes in a bottle
- Waterless: no black tank, chemicals or water
- The only dry flush toilet that separates urine
- 2-year warranty, 30-day returns
Version
What’s included
- S1 Dry Flush Sealing Toilet
- Sealing unit
- Solids bin
- Power adapter
- Battery box with the electronics (ships separately)
- 2 high barrier bag liners
- Bag pusher
- Urine bottle with one-way valve
- Manual
Ships in 2 boxes. Some assembly required.
Technical specs
- Dimensions (D×W×H): 17.0″ × 15.2″ × 16.5″
- Weight: 29 lbs / 13.2 kg
- Solids container: holds 1–2 uses
- Urine bottle: 1.7 gallon / 6.5 liter
- Power requirements: 12V 1.5A, 18W supply
- Battery: 12V Li-ion, lasts about 1 week between charges, depending on temperature
- Flushes per roll: about 20–25
- Cost per flush: ~$0.70 (#2s only)
- Material: ABS plastic body, stainless steel hinges
- Do not connect the S1 to power below 0 °C (32 °F) or above 40 °C (104 °F). Charging outside this range causes hidden damage that only shows up later.
Delivery & returns
Free shipping on orders over $150 in the lower 48 states and Canada. Canadian orders ship from our 3PL in Canada. Delivery time is estimated 3–5 days depending on location. We ship UPS Ground within the US, and can’t deliver to PO boxes.
Changed your mind? Send it back unused, in its original packaging, within 30 days for a refund. Return shipping comes out of your refund. We’ll send you a prepaid label, so there’s nothing to pay up front. Read the returns policy
Manuals & guides
Never see it, touch it or smell it.
One button heat-seals each #2 in a high-barrier bag. When the bin’s full, lift out the sealed packs and put them in the trash.* Nothing loose, nothing to scrape.
“So much easier to avoid the stinkies than the ole ‘bucket’ style competition.”
Don’t pay to pee.
Other dry flush toilets charge you a bag every visit, #1 included. The S1 sends urine to a bottle and only seals #2s, at about 70¢ each. Up to 80% fewer bags. Less plastic in the trash. More money in your pocket.
Never plan a trip around a dump station again.
Done it before? You know the queue, the hose, the splashback, and the trip cut short because the tank was full. Never had a black tank? Good. Keep it that way. No tank, no blue chemicals, no water. Empty the urine bottle where local rules allow and stay put longer.
Simple once it’s set up.
No coir, no layering, no composting. Learn the routine once, then it’s sit, push, walk away.
“The convenience of it is remarkable, once it’s set up it just works perfectly.” — Paul S.
You’ll never be without a toilet.
Life happens. Things break, refills get delayed. Lift the sealer out, line the bin with a bag, and the S1 keeps working as a separating toilet.
Super simple
Four steps.
Urine flows to the front into the urine bottle. Solids drop into a liner in the solids bin.
Push the button and the sealer does the rest, in about 3–5 minutes. Each #2 is sealed in its own bag.
The indicator tells you when the 1.7-gallon bottle is full. The bottle is opaque — discreet to carry and empty.
One liner roll is about 20–25 flushes. Empty the solids bin every 1–2 uses, and drop in a fresh roll when it runs out.
The numbers
Specifications
at a glance
- S1 Dry Flush Sealing Toilet
- Sealing unit
- Solids bin
- Urine bottle with one-way valve
- Power adapter
- 2 high barrier bag liners
- Battery box with the electronics (ships separately)
- Bag pusher
- Manual
- Ships in 2 boxes. Some assembly required.
Two versions
Which S1 is
right for you?
Go with the S1 12V if the toilet has a permanent home in your build and you have a 12V house system to wire it into. There’s no battery, so there’s nothing to charge.
The S1 with its own battery is for moving it around, or for builds without a 12V system.
Side by side
Other dry flush toilets wrap every visit, #1 included. The S1 sends #1 to a bottle and only seals #2s.
Don’t take our word for it
See why our customers
love CompoCloset
So much easier to avoid the stinkies than the ole "bucket" style competition.
I bought this S1 because the reviews were great and seemed user friendly and a good alternative to a standard compost toilet. I am using it in my tiny home and it fit excellently in my 200 square feet. It continues to seals in the middle of a flush, won't flush at all etc. I have emailed back and forth with their customer service person as they don't provide a phone number. Days later she responds asking more questions.. then said , I needed to update my brand new toilet through the app on my phone. Thank god that I had Bluetooth available to do so. Worked a couple of flushes and then here I was again taking it to the porch so that I could take the S1 apart and thank goodness that I have gloves on... I should of stuck with a bucket and bag for $35 . I am so disappointed and of coursebthey won't replace or refund... Don't bother spending $1500 on this, regrets.
Thank you for your feedback. We're really sorry to that you had issues with your S1 and that it didn't live up to your expectations.
Throughout our correspondence, we continued to troubleshoot the issues and aimed to find the best possible solution. When it was mentioned that you'd prefer to switch to our Cuddy Lite model, we were happy to help. The S1 can be converted to a Cuddy Lite by removing the sealing mechanism, and we promptly refunded you the difference in price between the two models.
As the sealing mechanism had already been used, we unfortunately weren't able to accept it back into our factory for health and safety reasons, but we hope the alternative solution has allowed you to continue using your toilet.
We're sorry again that your experience hasn't been what you hoped for, and we appreciate you taking the time to share your feedback.
Took a bit to get to writing but I wanted to be sure. That said, this S1 is the best overlanding toilet setup I’ve ever used, my wife and I both love it. The convenience of it is remarkable, once it’s set up it just works perfectly, simple as that. It feels robust, very stable to sit on, definitely can see that it is very well made.
Definitely worth the wait!
Thank you Paul!!
Overall functionality good…. Plastic lid hinge is too flimsy, washers and hinge fell out first weekend of use and had it be refitted. Instructions on bag “scrunching” before use were good…. But we needed more scrunching than anticipated before mechanism worked properly.
I suspect we will upgrade lid at some point.
Shipping date clarity could have been better… but it all worked out.
Looking forward to using this toilet. Customer service has been wonderful.
It is expensive but innovative. It separates the waste, and there is no odor at all. I wish the opening for Number 2 was larger to avoid accidents, but otherwise it seems well made. It has an app that functions to switch bag types and update the unit. Its size is perfect for our RV shower and can be removed. After looking at all the options out there, I am glad we settled on this one, as the other dry flush toilets do not separate urine (Laveo, Modiwell, Clesana) and/or have to throw out the entire bag if only partially used at the end of a trip (Laveo). The company seems interested in updating and making improvements on it for the future as well. It is an investment for sure, but coming from the black tank work, this is a much easier and cleaner option for boondocking and dry camping.
Thank you! We're so glad to hear you're happy with choosing the S1 over other dry flush toilets.
Really happy with this setup. I installed the S1 dry flush on my Cuddy Lite, which was easy. I love the dry flush function; it just works and makes dealing with the toilet less of a chore, especially on short trips. It's also great that the urine diverter is still totally usable with it. Definitely recommend it.
Thanks Johann! So glad to hear you're loving the sealer :D
Straight answers
Questions about
the S1
What is a dry flush toilet?
A waterless toilet that seals waste in a bag instead of flushing it away with water. No black tank, no plumbing, no dump station.
How does the S1 dry flush toilet work?
Urine goes to a separate bottle. Push the button and the S1 heat-seals the #2 in its own bag. The bin holds 1–2 uses.
S1 vs the Laveo dry flush toilet: what’s the difference?
Laveo twists every visit into a cartridge, #1 included, at about $2 a use. The S1 only seals #2s, at about 70¢ each, and urine is free.
What do refills cost?
About 70¢ per #2. One liner roll does 20–25 seals. #1 costs nothing.
Why does sealing take 3–5 minutes?
Our bags are thicker, higher-barrier plastic that holds smell in better. Worth the wait. Sometimes sealed packs stay linked together; keep scissors handy.
How do I empty the S1?
When the solids bin is full (1–2 uses), lift out the sealed packs and put them in your regular household trash. That’s fine in most places, but check your local rules. Empty the urine bottle where local rules allow; a light tells you when it’s full.
Can the S1 be stored in a shower or wet room?
The S1 is water resistant, not waterproof. Keep it out of the direct line of water, remove it while the shower is in use, or cover it.
Is there a backup if the sealing mechanism breaks or I run out of bags?
Yes. The sealing mechanism can be removed and the solids bin lined with a regular bag — it then works exactly like a Cuddy Lite.
What bag liners are available?
High-barrier liners, about 20–25 flushes per roll. Each S1 ships with 2 rolls.
Can I leave the S1 plugged in all the time?
Don’t connect the S1 to power below 0 °C (32 °F). In cold weather, unplug it at the DC connector or the wall.
How many flushes do I get per refill?
Approximately 20–25 uses per roll.
Why does the S1 have an app?
The S1 connects to its app by Bluetooth so you can tell it which bag material you’re using and get software updates. Day to day, you just press the button.
The other way
Already own a Cuddy
or Cuddy Lite?
The S1 Dry Flush Adapter Kit retrofits the sealing mechanism to the toilet you already have. Same footprint, same seat — new trick.
Time to 💩 or get off the pot
Your black tank called.
It’s not coming.
2-year warranty · free shipping to the continental US & Canada over $150
