No, I just weigh it before I pack it and/or bring portion controlled, single-serving items (I am very guilty of eating Lunchables and leaving the crackers behind in a pinch LOL). I actually pack both my breakfast AND lunch AND snacks when I go into the office, a 10 hr day that starts at 6:30 AM once a week.
The way I figure it I need to take care of Future Me's needs so I don't feel tempted to go poking around in the vending machine.
My lunch usually looks like this (I am 18m post op and am in maintenance, but my calories are low because I am a small person):
Breakfast:
Zero sugar Chobani, 1/4 oz of chopped walnuts or pecans, Super Coffee protein shake as a mid morning snack. (all in, about 200 calories and 25g of protein)
Lunch:
Veggies, some kind of dip (if you aren't making dips with greek yogurt what are you doing with your life?), usually a couple of "lunchmeat roll ups" that are each one slice of deli meat and half a slice of cheese, another 1/4 oz of nuts (usually pistachios this time), a couple pickle slices (usually somewhere around 250-ish calories and another 25g of protein)
Snacks:
Options include Babybel light and a couple triscuits, Campbell's Well Yes sippable soups, protein shakes, or half a protein bar (I usually end up with leftovers)(any of these would give another 10g or so of protein).
I eat dinner at home with my husband on these days and it's usually something protein-heavy