A tuck-box is a small pinewood trunk which is very strongly made, and no boy has ever gone as a boarder to an English Prep School without one. It is his own secret store-house, as secret as a lady's handbag, and there is an unwritten law that no other boy, no teacher, not even the Headmaster himself has the right to pry into the contents of your tuck-box. The owner has the key in his pocket and that is where it stays.(...) An average tuck-box would probably contain, at almost any time, half a home-made currant cake, a packet of squashed-fly biscuits, a couple of oranges, an apple, a banana, a pot of strawberry jam or Marmite, a bar of chocolate, a bag of Liquorice Allsorts and a tin of Bassett's lemonade powder.
As well as tuck, a tuck-box would also contain all manner of treasures such as a magnet, a pocket-knife, a compass, a ball of string, a clockwork racing-car, half a dozen lead soldiers, a box of conjuring-tricks, some tiddly-winks, a Mexican jumping bean, a catapult, some foreign stamps, a couple of stink-bombs, and I remember one boy called Arkle who drilled an airhole in the lid of his tuck-box and kept a pet frog in there which he fed on slugs.
Roald Dahl, Boy