As a planner, I always have my "emergency kit" with me on the day of the wedding, just in case if my client needs anything last minute. However, some brides are very prepared and have their own as well.
You can get your very own at Ms. & Mrs. The kit includes:
Toothbrush, Toothpaste, Dental Floss, Mints, Drinking Straw, Pain Reliever, Antacid, Hand Lotion, Emery Board, Clear Nail Polish, Nail Polish Remover, Facial Tissues, Deodorant, Tampons, Adhesive Bandages, Hair Brush, Hair Spray, Bobby Pins, Interior Mirror, Lint Remover, Mending Kit, Scissors, Safety Pins, Stain Remover, Static Remover, Super Glue, Double-Sided Hem Tape, Earring Backs, Corsage Pins and Extra Wedding Bands!
That should cover it!