I have quite a few perfumes but they are all in quite large glass bottles that are not easy to take with me on a day to day basis. I then came across this brand called Travalo which makes the cutest little perfume spray that you can fill with any of your own perfumes.
This involves no finnicky decanting just remove the spray nozzle on your perfume and attach the Travalo to the plastic stem and pump! Its amazing!
There is also a small clear window so you can see how full it is.
I got mine for £11 from Feel Unique. It holds about 50 sprays which is perfect if you want to take it with you in your everyday makeup bag (like me) or for a weekend away. It has also meant that I am more likely to use my perfumes as I know I can decant them into my Travalo so I can top up my scent during the day! Genius product.