Types of Geocaches

(Credit to Izzy Lash)

Large Geocache

By far, this cache is the easiest to find. It is the largest cache on the size chart and requires a big space which can make it difficult to hide. These are most likely to be hidden on the ground, and are 20L or larger.
(Credit to Izzy Lash)

Regular Geocache

Unlike the larger cache, these are smaller, but still pretty easy to find. They can be the size of a shoebox, but are usually tupperware containers with clips on the sides or ammo cans. These are also typically found on the ground and are 1L or larger, but less than 20L.
(Credit to Izzy Lash)

Small Geocache

Finding this type of cache can be a little more difficult than finding the large or regular ones. They can be the size of a pill bottle and can be easily camouflaged to make it harder to find. These are commonly found in trees or on the ground and are 100ml or larger, but less than 1L.
(Credit to Izzy Lash)

Micro Geocache

Out of all the caches, these are the most difficult to find. They are extremely tiny and can even be smaller than a fingernail. They are also screwed together in the middle, and are only big enough to hold a rolled-up log sheet. To make the experience even better, they are usually put in the branches of trees.

FHNtoday.com