Geocaching is using multi-million dollar government technology to search for $1.98 Tupperware in the woods.
Cache sizes are
Nano: Smallest cache size. go to ebay and search nano cachehttp://cgi.ebay.com/5-pack-Black-Nano-Cache-Blinkie-Geocache-magnetic_W0QQitemZ130375943105QQcmdZViewItemQQptZL H_DefaultDomain_0?hash=item1e5b0303c1#ht_693wt_973
Micro: These are very small about the size of your pinky (Not Robos pinky)./ go to ebay and search micro cachehttp://cgi.ebay.com/12-Micro-Cache-Containers-Geocache-Geocaching-FREE-LOG_W0QQitemZ380102459374QQcmdZViewItemQQptZLH_Def aultDomain_0?hash=item587fdf3fee#ht_500wt_765
Small: These are small but not as small as a micro. Most are small tupperware like containers. http://www.locknlock.com.au/products_c.php?cate1=1&cate2=2&item_seqno=50
Regular: 30 cal or 50cal ammo can.
Large: can be anything from a large ammo can up to a full sized fridge.
Travel bugs: dog tags that you attack to an item and the travel around the country or world.
Geocoins look like military challenge coins and are passed around from cache to cache.
I have 18 caches hidden and 4 travelbugs.
I have 2 more caches planed for placement then I am going to stop for a while. One of my hides is a 20# granite rocks with a micro glued into a hole i drilled into it. Then I placed it in a big pile of granite rocks.
You have difficulty ratings this is how hard it is to find. from 1 to 5. You also have terrain ratings. 1 being you can get to it from a wheelchair or stroller to 5 where you need special equipment to get to it. Like there are some out there that require you to climb a mt. or some that require you to hike for miles. There is one just north of my home town in the river that you need scuba gear to get to.
Virtual caches are not allowed to be placed anymore. We have done one that required you to read the information signs around the part and then respond to them in the log and also you had to post a picture of your team at the site with specific items in the picture.
You can not do an adults only cache where you place adult items like movies or mags. everything traded or left has to be kid friendly. Most people just go to the dollar store and pick up a bunch of trinkets to leave in caches. Me I just sigh logs and move one. My wife and kids like trading stuff.
My most evil one to day was where I took a limb off of a pine tree and drilled a hole in it and placed pegs to hold it together and the cache was a small pill fob in the hole inside. Then I took and placed the cache in the middle of a grove of pine trees and blended it in.
Check out http://www.geocaching.com/
search for 22554 to see my cahces under cpttango30.
As far as equipment good legs and back we have a backpack set up just for caching. First aid kit tick spray, mechette, hiking poles if you want. and Swag (Items for trading)....GPSr come in all flavours and prices. We use a Garmin Colorado, the most popular are that the oregon and the 60csx from garmin. We also have an etrex ledgend
The draw back to the ledgend is that you have to print out the cache pages to take with you. Some of the others like the colorado and Oregon series offer what is called paperless caching it downloads all the info to the GLSr......