Ye old pork rinds! Not a huge fan of them myself but they are convenient. I also make up cream cheese/green olive spread and put it on celery. Maybe bring a small cooler with you to work?
I really try to make the meals large enough (enough fat too) that I do not get too hungry in between, but it is very good to have something there to eat just in case. Those snack machines can be rough, ha ha. I bring string cheese also, if you are going to run over the carb intake, better to do it on that than a bag of chips or cinamon bun.
Tommy