Mine is a modified camera case. I bought used on e-Bay for about $45. It came with the dividers which are removable and are full of Velcro so you can rearrange them however you want. I wasn't sure how it would work, but after rearranging I couldn't believe how perfect it was. It's like this bag was meant for the Phantom! The Phantom fits snug and there is tons of room for extra stuff. The dividers are solid and soft, as you can imagine (was needed) for carrying expensive camera equipment.
I cut foam to size to fit on top of the open spaces to prevent smaller items from moving around. I have lots of room for expansion for more batteries and other accessories I plan on purchasing. This bag is great because it's fairly light, offers good protection, and doesn't look conspicuous when carrying it out on public. I can also wear it while riding my bike or hiking to a flying destination. Because of the extra foam, everything is snug and doesn't move during transportation.