Picture of Cell Phone Pouch
I set out to create a small container for my phone after finding poly vinyl in the remnants section of my fabric store.  Incorporating a little know-how, I now have a waterproof pouch to hold a few cards (like my ID and a credit card) and my phone.

I had fun making this, and it will take you less than an hour on a standard sewing machine. Good luck!

I made this at TechShop!
TechShop Pittsburgh:
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Step 1: Gather materials

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- Ruler
- Thread: This is not pictured, but I used an all purpose white.
- Fabric: I took the dimensions of my phone with the case on (height, length, and depth) and then cut out fabric pieces according to this equation:
width of fabric = twice the width of my phone + twice the depth of my phone + 1"
length of fabric = length of my phone + 1"
My pieces ended up being 6"x6".
Dimensions of the strap: 2"x6"
- Rotary cutter (or shears)
- Duct tape
- Pins
- Standard sewing machine

Step 2: Hem the top of the pouch

Picture of Hem the top of the pouch
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Depending on the weight of the outside fabric, you may need to duct tape the fold down. I could have pinned, but it did not stay in place very well so I chose to use duct tape.  Poly vinyl should not be ironed. Straight stitch inside the duct tape.

Step 3: Make the strap

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Hem the top of the strip of fabric as in the last step.

Fold in half of the length of the fabric and tape it down.  Stitch inside the tape.  Repeat for the other side.

Step 4: Attach the strap to the larger piece

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Duct tape the non-hemmed side of the strap to the inside of the large piece of fabric (be sure to have the nicer side of the strap facing out!).  Straight stitch close to the edge and trim the excess fabric.