Picture of Red(neck) Ops Gas Mask
This a tutorial on how to make a Redneck Special Ops gas mask. It has changeable filters, and you can change the type filter for your operation. 
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Step 1: Materials

you will need 2 bottles, a knife, duct tape, hose/tubing, respirator, and rubber bands.

There are many sizes of bottles. You will want to pick a bottle with little grooves and little bumps, to minimize distortion. Perhaps a 1.5 liter or bigger, but not too big!

Step 4: Breathing Tube

Now for the breathing tube. This part is so that when you look down you don't suffocate. That is the only flaw of my design for using small bottles. hey, at least I'm honest.
First, you will need to get a decent sized tube, and drill a hole the same size as the tube in 2 caps.
Next, tape it until it is sealed around the sides.

Step 5: Filter

This is pretty simple.
First, take a bottle and cut off the top, and put a filter on the top.
Next, tape it down.
Make more if you will be using it often.

Step 6: Put It Together

Now tighten the caps on really tight, and even tape it.
And you want it hands free, add rubber bands.