Refrigerated lunchboxes turn soggy
From personal experience, rice doesn't refrigerate well; I tend to buy quick-cook rice that I can just microwave so it's fresh when I need it, but I hear that it freezes better, with less moisture loss. Perhaps the vegetables can be frozen as well? If you spread them out on a baking sheet when you freeze them, they should be easily portionable later, but I don't know which vegetables you're cooking or whether they are hardy enough for the freezer.