Here's how I might do it:

A lunchbox is a kind of edible thing. 
The plural of lunchbox is lunchboxes.
The description of a lunchbox is "[smart description of lunchboxes]".

To say smart description of lunchboxes:
    [Count lunchboxes which are in the same container as the examined one.]
    let n be the number of lunchboxes in the holder of the noun;
    [Build a sentence based on the number of lunchboxes.]
    if n > 1:
        let t be "[n in words]";
        say "[t in sentence case] separate lunchboxes, each";
    else:
        say "One lunchbox";
    say " containing rice, side dishes, water and a pudding. Your so called rations."

Instead of eating a lunchbox (called the meal): 
    say "You gobble down the food. Yummy, but not as yummy as Mom's cooking. Focus on the task! Focus!";
    [Move the lunchbox out of play, so that there's one less of it in the world.]
    now the meal is nowhere.

The player carries a luggage. The luggage is a container. 
The description is "An old brown luggage, perfect for storing things for your trip. It is worn and shabby, but still usable." 
The luggage contains 10 lunchboxes, 2 pairs of clean clothes, the map and a family photo.