Recently purchased a DJI Phantom 3 Advanced . It truly is a great platform, reading up on Eric Chens site Skypixel (Worth it to navigate), he suggested a Duratool MJ-139-20.5 Weatherproof Tool Box case for Phantoms. I was able to use a different one, supplied by MCM electronics (Links below)
Found on Amazon here: http://amzn.com/B00QPQLWO6
Or MCM Electronics http://www.mcmelectronics.com/product/22-24120