Willow Design has announced a new line of slipcases for the 15.2″ PowerBook G4, 12″ iBook and 14″ iBook. The new slipcases are based on the excellent protection of the company’s previous Mac slipcase lines, but add more space for accessories. Willow said that slipcases for the new 12″ and 17″ PowerBooks are in production and should be available within the next couple of weeks.