CPR Assistant CPR Mask & 1-way Valve Pocket Resuscitator Kit

The mask performs well, and for a good price. The inflated rim has no leaks, the edge of the mask has a good seal if held in place (may need to tighten the strap by looping it into a knot). The strap may slip out if pulled too tightly, so I stuck a paperclip through the elastic band. Only problem I had isn't related to the mask itself. The metal ring for the carrying strap on the case cut my finger under the fingernail when I pulled the latch on the case. I bought 2, 1 to replace the mask in my first aid kit, and another to make a coronavirus mask. I cut out the center and duct-taped filter material over the widened opening. It's not easy to wear glasses with the mask, so I wore it upside down. Upside down leaves little extra space for the mouth, so the seal may be lost when moving the lips too much while talking. It may leave the bridge of your nose sore after a few hours. Moisture will also start collecting inside. You may want to block the O2 inlet with wax or glue. I think the advantages are a better seal and easier to disinfect/reuse vs a soft fabric mask.