These are the same 2 ml bottles that we used as “Sample Bottles” here at pheromoneXS. The tops snap on and off and therefore are super-easy to fill and/or reuse. Because there are no threads they might leak though. They are perfect for carrying just enough product in your pocket(book) when reapplication is necessary after a long day, or night. At the inexpensive cost you can really just toss them in the trash if needed to prevent others from discovering your secret.
After testing I have determined that for every two sprays from the fine atomizer of the sample bottle you get one spray from the regular 10 ml bottle. Each bottle holds just about 1.82 ml of liquid. You could potentially hold more but because of overfilling they have a tendency to leak more.