Dustless Technologies 15521 HEPA Filter for Dustless Backpack (Pack of 3)， Small， White<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Filter is strong fabric-like material</li><li>Filters 97.7% of dust down to .3 microns</li><li>Unique top has built-in cover to contain dust when changing filter</li></ul></div><img src="http://ecx.images-amazon.com/images/I/41hVs8D-gPL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/31d2-J%2B7rdL.jpg" noproxy>