This copper-bound box is two feet wide and
tall, and three feet long.

Invisible runes are
scribed upon its front; these reveal four
command words.

The first shrinks the box
to a twelfth of normal size, with all contents
likewise becoming minute. The weight of
the shrunken chest, empty or filled, is 30
pounds.

The second word causes the chest
(if of normal size) to function as one upon
which a Leomund's secret chest spell has
been placed (but with no smaller replica
necessary!).

The third word causes the box
to return to full size or normal place, as
applicable.

The fourth word causes growth
to quadruple dimensions, with sides, top,
and bottom of one foot thickness, huge copper bands, and a weight of 1,200 pounds.