The Wag Bags which come with the Pett toilet are an interesting concept in themselves. The magic powder doesn't mask odor, it contains (or triggers?) some sort of bacteria which consumes the nastiness of the waste. Note that "kneading" your biz from outside the inner bag is critical to the effectiveness of the product. Having used many Wag Bags with mixed results, I think there may be a better spin on that concept:
http://www.whennaturecalls.com/
I think these Restop bags may be better in that the outer bag is gas impermeable. (Not so with the Wag. Cost is the same at $3 a bag.) I got a sample bag from Restop, but I gave it to a buddy leaving on a trip. I'll report back with his findings. What I'm hoping is that this product doesn't behave like a Wag--as daveb says, you can't store a used Wag in your rig. (Well you can...but eww.) It takes the magic powder some time to fully work, and the more waste, the more time.
We've decided we don't want black water in our rig, and I can't imagine allocating as much space for a john as the decked out rigs have. Obviously, very personal preference there. Being long-time aces at dealing with waste in the backcountry, we just don't need it. We always have extra Wag Bags (Restop bags henceforth, probably) for an emergency. Pair that with a small bucket and you're set in a pinch. (Couldn't resist, soory.)
Rock climbers deal with the waste issue on every multi-day climb. The "pipe bomb" or "poop tube" has become standard gear for them. Built properly, these thingies are the shee for containing odor. In the pre-Wag Bag days we'd go in a paper bag and chuck that bag in the tube. No smell at all except when the tube was opened. I think using the Restop bags with a tube may be a good non-black water direction for temporary waste containment. FYI, here's how I build a bomb-proof tube:
Home improvement store materials:
10' x 3" or 4" triple-wall drain pipe: $3 (±$1 per tube), cuts easily with hand wood saw, accepts standard PVC fittings, super light and durable. PVC is much harder to cut, is heavy and costs way too much.
PVC cap for bottom: ±$1. Roughen inside of it with a knife, etc., mix epoxy directly in cap, slide it on then duct tape onto tube around the lip (or use silicone seal, etc.). Get the minimalist, cheap white one and not the big black one.
Plumbing test plug with expanding rubber seal/wingnut closure (the red one that says "stand clear when in use" [haha] on top): ±$5.
Shave off with a knife any ragged edge inside the opening, maybe a LIGHT coating of veg oil in this area (or on the plug gasket) Both keep the plug easy to remove/insert.
The finished tube could be as small as 3" x 6". We make them larger for climbing, depending on the route and how long we think we'll take.
Cheers.
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