2lt bottle full face filter mask

This is a full face filter mask using a pair of 2LTR soda bottles and various filter materials. The valves are one way and integrated into the connector. The filter retainers hold the layers of filter material in place. If you have a commercial filter canister, I included a 3M to bottle adapter you can use, although you will need to cut a sealing gasket from L200 foam or other high density foam for the canister side. Other materials needed are 1/2 inch elastic and a pop rivet tool to attach the four buckles. I used a paper coffee filter, charcoal filter sheet and high density cloth for the filter layers in the prototype.