A convenience store bento lunch box is a pre-packaged meal that is sold at convenience stores. It typically contains a variety of food items such as rice, vegetables, meat, fish, and other side dishes. These bento boxes are designed to be convenient and ready-to-eat, making them a popular choice for people who need a quick and easy meal on the go. The selection of convenience store bento lunch boxes can vary depending on the region and the specific convenience store chain, but they are widely available in many countries, especially in Japan where they are known as "ekiben" or "oekakiben" (train station bento).