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Chris Tollesleft a comment
Super cool - how is this different from "dry shampoo" or bar shampoo? Also, I get the travel angle, but I don't travel much. I doubt much of my environmental impact is driven by the water in my shampoo. Is there any benefit to home use besides the less-water-shipping-around-the-world thing?
Moondust Collection: Hair WashWater-activated powder shampoo.