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.
To unfasten the tongues Mercury must be in its house and it is efficient with those who Mercury rules. - Picatrix (Andalusia, ~1000.AD)