The term "packing like sardines" is often used to describe a situation where a large number of people or objects are tightly packed together in a small space. It is not always a desirable situation, and there are many antonyms that one can use to describe a more spacious or comfortable environment. Some of these antonyms include words like "roomy," "spacious," "expansive," "airy," "comfortable," and "relaxing." These words evoke a feeling of open space, ease of movement, and freedom to breathe, unlike the claustrophobic experience associated with packing like sardines. Using these antonyms can help to create a more positive and relaxing atmosphere in any setting.