Instructables
How to turn a potato chip bag into a pencil case.

It works for any kind of waterproof wrapper - I've even made this as a wristlet pouch with dollar bills instead of packaging.

Sorry for the lazy re-post (this site is brutal on dial-up!) - it was originally on Flickr, linked to Craftster (http://www.craftster.org/forum/index.php?topic=163488.0), but someone requested that I post it here.
 
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Step 1: Step 1

Picture of Step 1
Materials:

- chip bag
- zipper
- 2 pieces of fabric for lining
- 2 pieces of vinyl

Step 2: Step 2

Picture of Step 2
Place zipper, right-side up, on lining, right-side up. Line up the top edges.

Step 3: Step 3

Picture of Step 3
Place vinyl on top, lining up top edges.

Step 4: Step 4

Picture of Step 4
Place chip bag on top, wrong-side up. Line up the top edges.

Step 5: Step 5

Picture of Step 5
Use the zipper foot. Sew through all layers at the top edge.

Step 6: Step 6

Picture of Step 6
Flip the vinyl and chip bag to the front, and the lining to the back. Finger press.

Step 7: Step 7

Picture of Step 7
Top-stitch the zipper.

Step 8: Step 8

Picture of Step 8
Place sewn piece on other piece of lining fabric, right-side up (the lining is right-side up).

Step 9: Step 9

Picture of Step 9
Place vinyl on top. Line up all top edges.

Step 10: Step 10

Picture of Step 10
Place chip bag on top, wrong-side up. Line up top edges.

Step 11: Step 11

Picture of Step 11
Sew through all layers of the top edge.

Step 12: Step 12

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Open up the piece so that the zipper is exposed on both sides. Top-stitch near the zipper.

Step 13: Step 13

Picture of Step 13
Open the zipper, and place a scrap piece of paper on the vinyl. The paper keeps the vinyl from sticking together.

Step 14: Step 14

Picture of Step 14
Open up the piece so that the vinyl/chip bag sides are touching and lined up, and the fabric lining sides are touching and lined up.

Step 15: Step 15

Picture of Step 15
Use the regular presser foot. Sew around, leaving an opening (sewing path is highlighted). Trim excess fabric and vinyl/chip bag.

Step 16: Step 16

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Turn inside out, discard scrap paper, and sew up hole in lining.

Step 17: Step 17

Picture of Step 17
See photo.