Seems like we're pretty similar.

When I used to pack a lunch it was always a sandwich, a piece of fruit and usually something chocolate like a KitKat or a Twix (or some off-brand equivalent).

Sandwich often had some kind of lettuce, meat slice and maybe some other salad vegetable. Bread varied. Wholemeal some days, white others, depending on what loaf I was working through at home.

Fruit was generally apple, Gala preferred, although the rare ones that tasted amazing got more and more rare towards when I eventually gave up apples due to digestive issues. Occasionally easy-peel oranges of some variety. Satsumas or tangerines.

The sandwich went in a plastic, self-sealing sandwich bag to stop it falling apart. Everything then went into a plastic sandwich box to prevent things getting squashed in my backpack.

If I was going somewhere without drink making facilities, which was almost never, I would pack a flask of tea. Hot with milk pre-added. Can't remember when I sweetened it, it's been so long.

When this was for work, I already had my own tea-bags and sugar at my desk because the company-provided stuff was always terrible and/or contaminated somehow. Some filthy animal always put their tea or coffee-soaked spoon into the sugar bowl, because f--k everyone else, I guess. Anyway, I mention this because it might count as part of the packed lunch, since I brought it, even if it wasn't strictly brought every day along with the main items.

Edit to add: I sometimes used to pack a re-used 500ml plastic pop bottle with diluted squash in it as an alternative to tea. That would have been during summer.

Additional #2: I went through a phase of buying lunch at a local shop every day to save time preparing food in a morning, and realised with horror that it was costing me a four figure sum per year to do that. That gave me more impetus to make my own darn lunch!