If you've been looking for something a bit more substantial in construction for your mask, furniture designer Stephen Kenn has knocked out a rugged option made out heavy-duty canvas. Available in natural canvas, black canvas, and vintage olive military canvas, the masks have a soft wool inner layer for comfort and while they're not designed from the ground up to be medical-grade masks, they do have a zippered pocket to add a dust or filter mask to add another layer of protection. 

$25, stephenkenn.com