Car Keys
Pen
Gum
Purel (hand sanitizer)
retractable Toothbrush
Chapstick
Money (not always this much, but this is getbig, and i bench 600 for reps and am a multimillionaire!) 
Wallet
Phone
Small Pillbox (asprin and energy/fatburner type shit for energy every now and then)
*digital camera fits inside also, dont always carry it.
basically too much shit
*cut off the straps on the bitch, never wear it on my waist, just hold the thing in one hand like
a huge wallet.
car keys: leave them in your gym locker or hang them on the key rings by the front desk
pen: a pen? unless you have a log book with you, why would u need a pen? getbig autographs?
gum: put a piece in your mouth when you get out of your car
hand sanitizer: wash your hands before you leave the gym
retractable toothbrush: gym bag...in the locker. unless there is an impromptu photoshoot?
chapstick: youve got to be kidding right?
money: put 5 bucks in your pocket or sock if you need to grab a shake on the way out
wallet: lock it in your car/ glove box
phone: if youre serious about training, you dont take calls in the gym
small pillbox: take your pills before or after your workout
digital camera: **see toothbrush
there you go dude, just got rid of your strapless "fanny pack" (man purse) for ya......