I use this Pyrex MealBox 4-cup Divided Glass Food Storage Container almost every weekday. The three compartments keep my sides from mixing, and the airtight locking lid with the green seal hasn't leaked in my bag yet. Glass feels sturdy and cleans up easily, and it's fine in the microwave for reheating. It's a good size for one meal, though if you pack a big portion you may want the larger version. Happy with it for both home leftovers and taking lunch on the go.