The term 'IT MAY BE PACKED' can be solved by the crossword solutions GUN and HEAT. GUN is a 3 letter word and HEAT is a 4 letter word. GUN is a weapon that fires bullets or projectiles and is often used for hunting, self-defense, or in warfare. HEAT is a form of energy that is transferred from one object to another due to a difference in temperature. It is also used to refer to the sensation of warmth or hotness.