Year-Round rotating Batch composting toilet vid!
https://biorealis.com/composter/rotating/
Better to build your own probably....
https://greenloo.org/rota-pod/
That one is SELF-contained - much better design. Nope - that one still has a "drain hose" for "excess liquid"
That's the Huntington Ravine shelter at the summit - it's HUGE.... OK it's NOT the Hermit Lake shelter... OK so the Rotating 5 vault system must be THIS one - Rota-Loo 950 for YEAR-round use

Utilizing a "five-bay" or batch-style layout, the system allows waste to be isolated into rotating compartments. This gives earlier deposits ample time to break down naturally via aerobic decomposition before being emptied, ensuring the system can handle fluctuating crowd sizes....Winter, Spring, and Fall: The flush toilets are closed, and composting/pit outhouses are opened for public use https://www.outdoors.org/destinations/new-hampshire/hermit-lake-shelters/
The Appalachian Mountain Club proposed a five-bay composting toilet system for the Hermit Lake Complex Shelters in the White Mountain National Forest

- Accommodations: Includes three-sided and four-sided wooden shelters/lean-tos and tent platforms serving winter mountaineers and skiers.
- Caretaker Cabin: Staffed year-round by an on-duty Appalachian Mountain Club (AMC) / U.S. Forest Service caretaker who provides daily weather forecasts, avalanche bulletins, and emergency support.
- Winter Operations: Outhouses are open, and water must be treated or boiled directly from the nearby Cutler River
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Moldering privies, or slow-composting dry toilets, are more cost-effective and efficient than traditional pit or vault toilets, as they don’t need to be emptied or have new holes dug. They also tend to produce less odor.

Humus from NPS composting toilets is domestic septage and deposits in permitted landfill or wastewater treatment plant, unless it meets 40 CFR 503 requirements as a Class A or Class B sludge. Fecal material in a form easily transported is the primary function, for NPS purposes, of a composting unit.
The U.S. Forest Service has found that recreational user acceptance of composting toilets is extremely high, since well-functioning units have no offensive odor and are considered an environmentally sound waste disposal method.
From the crest of Mount Le Conte in the Great Smoky Mountains to the isolated beach of Kaloko-Honokohau National Historical Park, park visitors can find composting toilets built following the latest designs and technology in national parks across the country. For NPS, perhaps the most successful example of composting toilets is at Northern Cascades National Park where composting toilets have successfully operated in 16 locations in alpine and sub-alpine elevations for almost 30 years!
Huntington Ravine trail is the hardest in New Hampshire vid
- Site: Hermit Lake Complex (located in Tuckerman Ravine / Huntington Ravine area)
- Forest: White Mountain National Forest