Just Living To Eat
Even if a person is too busy with their lives, we bet they could still lend a minute to at least seal the plastic food container if they really lack the time and energy to purchase some food containers. They might have missed the lesson where it says that once a food package is opened, its shelf life is greatly reduced.
Still, the best option is to purchase proper food storage containers. Doing so keeps the food quality good for longer periods of time, ensures hygiene, prevents bacterial growth, and minimizes chances of spoilage. Hopefully, someone will teach this person a lesson.