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Edit by Guy Kuo

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[title] Plastic Bag - Easy to Obtain Disposable
[* black] Bag needs to be large enough and well sealed. Many readily available bags are usable.
[* green] Adequate seal and gas flow are readily readily monitored by bag's positive pressure inflation.
[* yellow] View window is easily added to any bag using packing tape and a piece of transparent plastic sheeting like laser print film or even mask visors.
[* icon_note] Because HALO uses a large volume, compliant bag, wearer can take full size breaths. As a positive pressure system, wearer is also spared the work of pulling air through a filter.