I usually do a box meal with what ever i have.
Last week for work I had a malmasson inspired cobb sald, which was sliced avocado, grilled aubergine, peppers, roasted charred corn, grilled courgette, squash, and crisp gem lettuce, all tossed in a ranch dressing and finished with Parmesan cheese.
I also made Tabbouleh.
Another day I had freekah, cubed roast squash, grilled courgette , red pepper, pecans, cubed cheese and apple.
Anything like those salads are easy, personalised to your own taste and don't go soggy.
My rule of thumb is a grain, a fruit, a protein, a green of your choice eg rocket, as the base and add what ever you have, eg and make a dressing separate and poor on when ready.
Or you could do a falafel wrap. Its dead easy to make falafel.
Or a black bean and rice burrito. Thats easy to carry if its wrapped in foil.
or Blackbean and sweet potato quesadila
my favourite is Pomegranate and aubergine with hummus flatbreads They are good for airplane/ train journeys👍
All these are quick, transportable and tasty.