I've been using FFP2 and N95s with the straps cut off, under a rather stiff cloth mask that is largely the same shape in the front as most respirators (so it do

I've been using FFP2 and N95s with the straps cut off, under a rather stiff cloth mask that is largely the same shape in the front as most respirators (so it doesn't crush the front), and is attached by a large velcro strap around the back the head (with holes on the side so as to go around the top and bottom of the ears). I've found this easier to put on and take off quickly, while maintaining at least as good a seal. KN95s are a bit confusing to me in that, in my experience, they definitely don't have the common sense "this air is clearly being pushed through a filter" feel of breathing through a well-fitted FFP2/N95, but at the same time, don't give an obvious sense that there is a leak somewhere.