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Step 4
Remove the elastic bands from a normal mask and fix them in the bottle at the eye level, so you don't have contact with your hands, just as in the images.
+This step takes time, try the mask on several times to make sure it fits perfectly on your face.
Step two
Make a U-shaped cut on the bottle. Use a marker to draw a "U" on the front of the bottle, with the cap side facing down. It needs to fit well on your face. As you can see in the image.