Step 4: Sew on bottom
Without cutting the thread from sewing the sides, continue to sew on the bottom.
Again, pull tightly after each stitch.
Stitch the last stitch twice and plunge the needle through the neoprene for 2, 3 cm and then cut the thread and it should hold.
Now that you've finished sewing, turn the Mobile Phonebag "inside-out" or just the other way around since there is no right side.
Straighten the stitches so that the layers of neoprene you sewed together now face each other. This gives it shape and makes the seams look much better.