When you're traveling, the last thing you want to do is bring your entire bottle of expensive perfume.  That's why these little gadgets were invented.  Simply place them on top of your perfume bottle and insert as much perfume from your big bottle to these little ones.  

They easily fit in your bag or purse for a quick "touch up" while you're out and about enjoying your vacation.  Because of their size and easy to use mechanism is why they're on our traveler "Must-Have" list.