50 ml is a small packaging, but that also means you can take it in your carry-on when traveling. EdP fragrances are slightly less concentrated than normal parfums.
From Cosmetify
Kilian Musk Oud Eau De Parfum Refill: 50ml
Vitaminsuk.com
Kilian Musk Oud Edp Spray Refill 50 ml
This product is also available at 2 unverified stores.