While out there in search of Geocaches one can find all kinds of containers. Bison tubes, pill bottles, clip lock lunchboxes, plastic peanut butter bottles, ammo cans, etc, etc, etc. Some Geocachers put in a lot of effort to create really unique and memorable caches. One of these I found in the Baakens Valley close to the Lower Guinea Fowl Trail under the fynbos a year or so ago. The container consisted of a pill container nicely fitted in a hole that was drilled in the back of an antelope skull.