Going back to work after a few months off and....

banana, cheese, hard cooked egg, mixed berries, crackers, pretzels.

I like hummus with pretzels and/or wheat thins (Tribe is the best.)

I recently started a new job too and can very long days. 1st one was 11 and we're out in a shaved ice truck so not a lot available food wise. I took a peanut butter sandwich/banana, Nutri Grain bar (those things are tiny though), pretzels, and oatmeal cookies. I forgot my cashews but usually get the large jar at Costco to have a portable source of protein that doesn't need refrigeration.

I like wraps with interesting fillings (usually chicken with various other fillings). One of my current favorites is shredded or chopped chicken mixed with mayo and walnuts or macadamia nuts or pepitas, maybe some dried cranberries or chopped celery. Then some greens like lettuce or baby spinach leaves.

I also often take leftovers - that's my favorite kind of lunch!

Will you have access to kitchen facilities? I love having toasted sandwiches for a bit of a change, they're nicer than plain sandwiches which can get a bit boring after a while.

For a snack I like yoghurt or a hard boiled egg. I also like rice crackers because they give me a much needed crunchy savory hit that I would otherwise get from potato chips. 

My schedule is similar 10-12 hours when not traveling. I eat very little fat so this might not work for you but keeps me happy. I keep a pint of grape tomatoes on my desk for snacking. Sometimes I mix them with 1% cottage cheese for protein. I alway have cottage cheese. Have a good sized container of fruit salad, boiled chicken or tuna salad stuffed (minimal light mayo) in mini peppers so they are portable. Apples and other whole fruit, carrots, rice crackers, pretzels and for a treat fireballs.

That's pretty much it since I have a situation where I really do not have time every day to sit and eat so it is just snack or grab and go. I make it all on Sunday and I bring food for the whole week on Monday and leave it in the refrigerator in a tied up bag so I don't have to mess with it during the week. Works for me and I don't feel food sluggish.