Hairspray and Dry Shampoo Tossing a can of dry shampoo or hairspray in your gym bag might seem convenient. After all, a few spritzes of the stuff can make a huge difference in refreshing your hairstyle. However, you might want to steer clear of keeping aerosol cans in your travel bags as flammable products are at risk for leaking when left in direct sunlight. Image Source: Pexels / Tofros