I LOVE my backpack ! This is the best bag I have found for my P4Pro. Absolutely awesome and beautiful.:) Not cheap but I got it from Amazon.
https://www.amazon.com/Manfrotto-MB-BP-D1-Professional-Equipment/dp/B017AED18Q/ref=sr_1_1?ie=UTF8&qid=1505129269&sr=8-1&keywords=manfrotto+drone