After owning 4 different backpacks, I like the
Think Tank backpack best. It's a bit pricey at $240, but it's extremely roomy inside compared to the others that use a custom fit foam insert. I especially like the hip belt when I go on long hikes. It holds all model Phantoms, but the interior walls can be moved around to accommodate special items, making this not only one of the most roomy backpacks, but one of the most flexible. I'm pretty sure it can be configured to hold an RC with a DBS mod antenna installed, but I don't think that's true with an FPVLR antenna, due to total height.
However I have noticed the
ProCraft is very much like the ThinkTank at a much lower price of $119. If I had to buy another backpack, that's what I'd buy. It's also re-configurable, roomy, and includes a hip belt.