Definitions of compactly:

• adverb:   taking up no more space than necessary

  Example: "Liquid food compactly stored in a pressurized tank"

• adverb:   in a compact manner or state

  Example: "The children were packed compactly into the car"

• adverb:   with concise and precise brevity; to the point

  Example: "He wrote compactly but clearly"