Hmmm, depends. I suppose he already has a binder, so that would be rather useless as a gift... you could give him a nice and cool looking (STP?) packer if he doesn't have one already (they're too expensive for 'just a present', I think though)
Not everybody packs or wants to though, so I don't know if it's something for him.
Or... I dunno... if you know his taste in clothes you could buy him a t-shirt, I suppose. Or any other men's product. Maybe even a razor and shaving cream, so he can look forward to the day he can start using it

Of the 'practical' FtM presents I'd probably prefer the packer (totally ignoring the cost right now (if I go for TOTALLY ignoring I'd say the Reelmagik or Tyron 3 prostetic, but HELL those are expensive O_O not something for a bday present, lol), but generally I'm more someone of the 'experience presents' like music tickets, or a day out to... somewhere, so I can't really put myself into his shoes properly.