Where do you live? If you're in the UK you can get "protein rolls" from Lidl supermarkets (9g carbs in 100g product unlike bread which is 50+g per 100g) that are pretty good - do a search on "Lidl protein rolls" for more info. Or you can do lettuce leaf wraps - also when I do a packed lunch things like babybel cheeses, cooked good-quality sausages and good old boiled eggs are also easy to put in a lunchbox. Not forgetting proper (i.e. NOT "low-calorie" or "low-fat") greek-type yogurts, cottage cheese, home-made coleslaw (veggies & proper mayo) is also good. Just needs a little bit of preparation - but a lot more interesting than just sarnies!