You want to make sure you're prepared for any kind of emergency on your wedding day. Consider packing a satchel or gym bag with some or all of the following items:
Aspirin, antacid, and sedatives
Baby wipes
Ballet slippers for dancing
Blow dryer
Brush, comb, and hair spray
Clear nail polish, nail glue, and emery board
Contact lenses and solution
Earring backs
Extra copies of wedding-day and transportation schedule
Eyedrops
Makeup
Masking tape (for ripped hems) and double-stick tape
Pins (bobby, hair in blonde and black, safety, and straight)
Sewing kit complete with thread in white, black, and bridesmaids' dress colors; have needles threaded and ready to go
Smelling salts
Stick stain remover
Stockings (two pairs)
Straws (for a quick drink without messing up lipstick)
Studs, cuff links, and bow ties
Tampons and sanitary napkins
Toothbrush, toothpaste, dental floss, mouthwash, and breath mints
Tweezers and crochet hook (to get at button hooks and other teeny places)
White chalk (a savior for lipstick on a wedding dress or shirt collar)