Sometimes I fill pre-fill 2 or 3 carts to carry throughout the day, and sometimes I just grab a flavor of the kind that I want and fill the same cart after my current one runs out. I started filling on the spot because I noticed that when I was filling several carts, some of the liquid was either drying up, or leaking out and there wouldn't be as much in it by the time I opened it up as I had put in it. How do you guys carry your e-liquids throughout the day?