this is a paper bag. You can use this as an insert if your mask design permits. Otherwise you can check these bags from which you can make a complete mask: https://www.ezvacuum.com/vacuum-bags-for-diy-masks.html
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this is a paper bag. You can use this as an insert if your mask design permits. Otherwise you can check these bags from which you can make a complete mask: https://www.ezvacuum.com/vacuum-bags-for-diy-masks.html