You will need:
An empty, rinsed out shampoo bottle
- craft knife
- 1/2 inch wide elastic
- pin -safety or straight pin
Now cut down the sides, after you've cut off the top, you can switch to strong scissors if it's easier. I think a craft knife is neater. Cut half way down the bottle on both sides, then across to remove the front section.
Flip it to the other side, and cut the flap. You'll want to bring it in past where the sides curve. The top of the flap can be cut however you want. I curved mine.
Cut out slots for the elastic- just over a half inch wide, and spaced at least a 1/4 inch apart.
Thread the elastic through the slots so it goes under the area between the slots and the rest is on the outside of the bottle.
Now close the flap over, and pull the elastic as tight as it needs to be to hold the case closed. Overlap the elastic and pin it, then trim it so there is a half inch overlap. Cut the elastic, and stitch the overlapped elastic closed.
It's done! Just that easy.
Mine is for the gym, but I'm sure there are lots of other uses for these cases.