Question: must have gym bag accessories?
Answer: Dry Shampoo. Regardless of the time you workout, it's likely that you're heading to work or grabbing dinner with a friend after you get your sweat on. ... 
Flip Flops. ... 
Microfiber Towel. ... 
Hand Sanitizer. ... 
Rollerball. ... 
Hair Elastics (or Rings) ... 
Deodorant. ... 
Pre or Post-Workout Snack.