Step 1: The problem
Step 2: Prepare the tape strip
Now fold the top and bottom edges over on themselves so that you have tabs. These will be used later to open your bag when you're ready to remove your screws. See the picture, below.
Step 3: Add screws
Step 4: Wrap it up
Press the sides together to seal the small parts inside. See the remaining images.
Step 5: Finished
To open the bag, just pull the tabs apart.