my sons prefer "picnic" type lunches so I will often pick from each category:
protein:
- yogurt (plain, whole fat with either vanilla, cinnamon, or fruit added...sometimes with stevia depending on the sweetness of the addition)
- raw cheese chunks or strips
- nitrate-free ham, salami, etc
- leftover roasted chicken, pork, etc.
- chicken or salmon salad
4 yo who can spread within the time contraints of lunch

:
- liverwurst (packed with, but not on wasa crackers..will get soggy)
- smoked salmon (packed with wasa and cream cheese or butter)
For the older child I sometimes include crispy nuts
veggie:
- broccoli (with or without Parmesan or butter)
- frozen peas (defrost by lunch and help keep everything cold)
- carrots (steamed/buttered or raw depending on which child...sometimes with a TF cream cheese spread/dip)
- steamed green beans
fruit (anything they don't need help eating - ie no pits, etc):
- fresh, sliced fruit (blueberries, pluots, apricots, banana, peaches, mango, pear, pineapple, etc.)
- frozen chunks (blueberries, cherries, peaches, mango, strawberries, etc.)
- dried fruit (raisins, mango, etc.)
carb (I leave these out a lot since they are hard to be TF):
- pretzels
- TLC cheese or 7 grain crackers
- wasa crackers
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Besides "picnic" type things, I will also do some sandwiches:
- natural PB, raw honey and butter
- ham and cream cheese
- salmon salad
- chicken salad
- honey and butter
- cream cheese and honey
I just started making 100% WW, soaked, no kneed bread (see thread in this forum), but last year I made any sandwiches with Food For Life's 7 grain WW pita bread (not soaked or spouted, but thinner and easier for my little guys to bite into) I didn't worry about it since they rarely want a sandwich...they'd just take it apart and eat the inside most days

HTH!!!