In my cube, I keep a glass dinner plate, large bowl, knife, fork and spoon and we have a kitchen with a washing sink so I don't need to carry anything like that. If I have to carry something in a container, it will generally be a plastic (light) container. Most of the time, I have veggies and hummus with a couple of apples and cheese. I tend to cut enough veggies for 2-3 days, bring enough apples for the same, hummus (bought) will last about a week and a 500gm/1lb block of sharp cheddar will also last a week. Mondays, I'll bring in a bunch of things but Tuesdays and Thursdays, I may have leftovers at work (in the kitchen fridge). I have a Bullet blender at work that I use to make my protein breakfast shake in the morning after I arrive, I'll bring the protein mix about once a month. Whatever lunch I bring, I will put it into a plastic bag in the bottom of my pannier so if it leaks, it won't be on my clothes which tend to be packed on top of the lunch bag.