My windscreen is pretty minimalist. It is about 0.2 oz of doubled aluminum foil. Weighs about the same as the Cat Stove. I should also point out that I only use an alcohol stove for short trips; I use a canister stove for longer trips. After several days, the weight advantage of alcohol gets smaller and, at least for me, the convenience of the canister becomes more important. YMMV.
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May I walk in beauty.