The word "packed in" denotes the idea of being closely confined or crammed. Its antonyms can include words such as spacious, uncluttered, uncrowded, spread out, roomy, or open. When we describe an environment as spacious, we imply that there is ample room for movement and that it is not confined. Some examples of its usage could be a spacious living room or an uncrowded beach. An uncluttered desk or an open garden can be used to replace "packed in" in a sentence. Thus, the antonyms of "packed in" give us a diverse range of alternatives to convey a similar meaning with a different nuance.