I uploaded a picture of one of my mini letterboxes. It is under the
PHOTOS, 3 menu entries below POST which you can access if you are
logged in. The mini is a modification and improvement of the micro
letterbox (there is also a picture of one of those.)

The mini is made by taking two 35mm film containers and using packing
tape to join them end to end. Half of the box contains the log, 8
sheets of paper, 4 x 1.5 inches. The other half contains a small
stamp and a homemade stamp pad.

It is very easy to create one of these to put in your luggage for a
trip.

The one showing here is "Christmas Cedar" in Boone County Ky.

Rick aka Flyfisher