A suitcase in a dream usually marks a transition already in motion, and what you're packing often mirrors what you feel you need to carry into the next stage. An overstuffed or impossibly heavy suitcase can point to a burden you're bringing forward that might be worth setting down first.
The Superior Planets are most efficacious; the inferiour are weak, and easily do suffer by the Superiours, and receive good or ill from them. - William Lilly (1602.-1681.)