Step 1: Materials
For this project you need:
Fabric - size determined by the size of your phone, but 8x10 is a good default
Step 2: Tape fabric
Begin by placing strips of duct tape along the back side of the fabric.
Slightly overlap the strips of tape.
Peel the fabric off the table and trim off the excess tape around the edges.
Step 3: Turn Edges
Place a strip of tape across the two short edges on the right side of the fabric.
Turn the fabric over so the taped side is facing up.
Fold the short edges over so and tape down so that a little bit of the fabric shows on each edge.
Trim off excess tape.
Step 4: Staple Sides
Measure the pocket for your case by wrapping the fabric around your phone as in picture 1, making sure the fabric sides are facing each other ("right sides together").
Staple along both sides of the pouch along the full length of tape, as in pictures 2 and 3.
Step 5: Cover Staples
Place a piece of tape along the entire length of the sides you just stapled, making sure the fabric is facing you.
Fold the taped edges over along the staple line so you are folding back about 1/2" of the fabric, and tape down.
Either trim the edges of the tape and skip to step 7 or fold under the bottom tape to the other side, and leave the tape at the top long for an envelope finish, and proceed to step 6.
Step 6: For envelope flap
Fold the two edges towards the middle.
Roll the remaining tape under the flaps, so it works sort of like double sided tape.
Press down corners to adhere.
Step 7: Finish
Now for the magic!
Turn the whole thing right side out. Use the point of your scissors to help poke out the corners.
If you like, add sticky velcro tabs for closure. I've found the sticky tabs adhere really well to the duct tape side, but need to be stapled down to the fabric side.
You're done! Wasn't that fun?
Post a picture of your own in the comments and I'll reward you with a 3-mo Pro membership!