Glossary - Sizes and Difficulty
Not only are there different types of caches, the size of the container hidden in a cache also varies. Geocaching.com uses a grid with 5 spaces to denote the five sizes. There is a red dot in one of the spaces to indicate size. Listed below from smallest to largest are descriptions of the different sizes. An example is given to help you visualize the size.

Micro

The smallest size cache container. Example, 35mm film can, hide-a-key. This size container often has room for only a log book. You even need to bring your own pen to sign the log book. As you can imagine, these can be hidden anywhere and everywhere. Some are magnetic. They can present a real challenge.

Small

The 2nd size cache container. Since geocachers can decide what size to call the container they are hiding there is some cross-over from the micro size here. Check the written description of the cache site. The creator will often state the type of container. Some of these are magnetic. This size can present a real challenge.

Regular

The 3rd size cache container is of a moderate size. Example, 6x6 tupperware container, pint sized plastic jar, 50mm ammo can. This size container is often hidden in bushes or under leaves. Some cache site creators can be quite creative with the hiding places for these larger container. Making the cache container larger doesn't make it any easier to find.

Large

The 4th size cache container is big. Example, 12x12 tupperware container, 1/2 gallon sized plastic jar, double-sized ammo can. This size container is sometimes on the ground but can also be found suspended high above the ground. Some cache site creators can be quite creative with the hiding places for these big container. Making the cache container larger doesn't make it any easier to find.

X

The 5th size cache container is a specialty cache. The X stands for extra. This can be an extra cache added to a MultiCache set. Multicaches are described on the glossary - types page.

Hollow Box

Another of the 5th size of cache container and also a specialty cache. This denotes a Virtual Cache which is described on the glossary - types page.

Difficulty

Shown on the cache site description page. Uses a scale of 1 to 5 where 1 is very easy to find and 5 is very difficult. Refers to how well the container is hidden.

Terrain

Shown on the cache site description page. Uses a scale of 1 to 5 where 1 is level ground or no major obstacles and 5 is a steep slope or a lot of obstacles. In Delaware obstacles could be brambles, poison ivy, swampy conditions or even an abundance of flies or mosquitoes.