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Posted by DesertJazz on 10/29/2020, 10:33 pm, in reply to "Bags
The bags were not recommended by the study. Someone sent them to UC so they tested them and made a video with them that has resulted in some people thinking it's a recommendation. The recommendation for the study is for Bell Covers and Slitted Masks.
They described the arm holes as still emitting aerosols, and the inconvenience of it not being worth any small gains. If you look at the charts it's a negligible amount. You gain more by including a disposable MERV-13 layer inside the bell cover honestly.