The men can change their clothes on the court. The women usually have their dresses in their lockers, which is where they go to change. Plus, the men prepare for best-of-five sets matches, so they have to carry more equipment than the girls.
Oh, and the bag has space in it left over. It's not like both bags are fully packed.
The men need their make-up bags. They don't just go out on the court looking like that, you know. And leaving the make-up bag in the locker room could lead to lip gloss theft. It's tough being a beautiful man. Look at Radek Stepanek. That handsome devil never ever leaves the house looking like shit.
"There are more dogs than women in the locker rooms" - Liz Smylie "I'm really feeling my balls" - Serena Williams "She had him in her box... It made his week!" - Tracy Austin "Tell us Rafa, what else do you do with your right hand?" - Todd Woodbridge "I have a pain here, in my famous ass" - Rafael Nadal