Instruct: Classify a review as either positive or negative.
Query: Earth-friendly and Effective, Great for Travel, Gentle on Skin

I've used crystal deodorants for years, and they DO work. It's great for sensitive skin. For travel, it's one less liquid/gel to carry, which gives me room in my 1 quart bag for something else. Beyond that, it's earth-friendly because it lasts and lasts, and there's minimal packaging.