At Overland Expo SoCal, CompoCloset presented the S1 Dry Flush, a urine-diverting dry flush toilet designed to heat seal only solid waste. The result is cleaner handling, reduced plastic use, and an alternative to traditional black tank systems.
From Kickstarter to Real-World Builds
Last year, the S1 dry flush funded in minutes on Kickstarter and moved into presale shortly after. While development has taken slightly longer than expected, deliveries are now scheduled to begin at the end of April.
At Overland Expo SoCal, the S1 moved from concept to real-world use. It was described at the event as “the most anticipated toilet in overlanding.”
Attendees were able to see the system in action. They gained a clear understanding of how the urine-diverting, sealing design works.
Feedback was immediate, with many noting how intuitive the system felt compared to existing options.
During the event, the first live install was completed on-site. A backer’s Cuddy Composting Toilet, already installed in a custom van from Momentum Vans, was converted into an S1 using the S1 Adapter Kit.
Why that matters:
No redesign of layouts required
Existing Cuddy and Cuddy Lite units can be upgraded
Builders can offer multiple toilet options from a single footprint
What Makes S1 dry flush Different
The S1 Dry Flush separates liquids and seals only solid waste. This approach provides:
More controlled waste handling
Reduced plastic use compared to traditional dry flush systems
No need for powders or chemical additives
A more familiar, flush-style experience
A New Direction for RV Toilets
Historically, RV sanitation has centered around three main options:
Black Tanks
Composting Toilets
Traditional Dry Flush Systems
What stood out at Overland Expo SoCal was growing interest in alternatives that reduce reliance on water, chemicals, and infrastructure.
See It in Action
Video from Overland Expo SoCal shows both the S1 in use and the first live install.
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Erica Pugh is Co-founder and Head of Marketing at CompoCloset.
She realised the necessity (for her) of having a toilet for travel and vanlife during multiple trips in the USA and Europe
When Richard asked if she wanted to help bring CompoCloset to life she was all in.
From the beginning Erica's goal for CompoCloset was to educate people on the benefits of composting toilets and to build a community of like minded portable toilet users. She now knows way too much about other people's bowel movements.
From Orcas Island, Washington she now lives in Vienna, Austria.
