Im currently on holiday in Barcelona (yay! sun, sea and tapas!). When I go away I'm forever struggling to identify my passport from the others I am looking after. So I made a cover for mine. Making this cover is a very quick project - it took me about 30 minutes.
What you need:
Cut a 34cm x 16.5cm rectangle in both your main and lining fabric. Cut another rectangle, this time 12cm x 6cm, in your main fabric.
With right sides together pin the large rectangles together. Stitch using a 5mm seam allowance but make sure to leave a 5cm gap on one side.
Cut off the corners being careful not to catch any of the stitching.
Turn out the right way and press. Slip stitch the gap closed.
Take the smaller rectangle, this will form the fastening tab. Fold in half, right sides together and stitch one short edge and the long one using a 5mm seam allowance. Trim the seam allowance and turn out. Press and top stitch.
Go back to your main cover and press in half. Then fold each edge towards the centre so you have a 6cm overlap. Press.
Now you need to work out where the fastening tab will go. Fold under the raw edge of the tab about 1.5cm. Fold the cover in half and place the tab over it so it is even on the front and back. Pin the back in place.
Stitch in place near to the edge of the tab and the end of the raw edge. Add the popper to the back side of the tab and the front of the cover.
Finally, top stitch all the way round the cover making sure you move the tab out of the way.
You should have something that looks like this.