well you go to the northwestern region of the sea then go to the island nortwesternly located
there is no bomb bag in bannan island. you have to get it on isle of gust
dig west of the sign in front of the old wayfarers hut
Northwest sea. Big island with the big mountain separating the wayfarers' side and the other one. Can't miss it.
to get to bannan island go to the north western sea chart its the on farthest north and weird shaped
He makes the blade for the phantom sword. Once you have collected the spirits, and beaten the ghost ship dungeon, he is the one you must speak to to start making the phantom sword. His Island is northwest of Bannan Island.
In Link and the legend of Zelda, Phantom Hourglass, you get the hammer in the isle of ruins, or the island of the dead.
it is on eddo's island
At the Goron island dungeon
you get it in the temple of courage at modlia island
in the ice temple on frozen island
In the temple
boomarange