Here are the items in my geocaching pack.
Staring at the lower left is my GPSr, with lanyard that has a small compass and thermometer attached. For urban caching, I will attach this to a belt loop. When out in the wild, I will attach this to the shoulder strap on my pack. (In the event of a fall, I like to have everything attached. This also makes it much more difficult to leave the GPSr behind.) At least one set of extra AA batteries are stashed in my pack. This lanyard is made of about 20 feet of paracord.
Moving to the lower center, the green canvas bag contains my specific geocaching tools:
Needle nose pliers
Compact mirror – this works well for looking under benches and other areas
Extendable magnet – used for reaching some caches
Small yellow “grabber”
– pushing the button on the end extends out fingers for grabbing items
Tape measure – for measuring, also for reaching some magnetic caches.
Moist towelette – for cleaning up afterwards
A couple of different pens
(always good to have a backup or two when signing the cache log)
Continuing around to the right:
Multi-tool, flashlight, glowstick (caching at night makes things more interesting…)
Back toward the center
Small first aid kit with tape, band aides, antiseptic, etc.
Extra carabiner (I usually have a couple of these)
Bug spray - In warm weather, I attach this to the outside of the pack
Sun screen in warm weather (but not in this picture)
Sharpie marker – for signing the more challenging caches.
Upper right – fire kit
Magnesium bar with steel attached, hacksaw blade for grinding magnesium and striking
Pill bottle of petroleum jelly cotton/drier lint for tinder
Magnifying glass and fensel lens magnifier
I have since added some waterproof matches in an emergency whistle container
(this also has another compass)
I also carry extra log sheets in a film container in case I find a cache with full or ruined log sheet. I put a couple of ziplock bags in my pack as well. Over the winter, I added an emergency blanket.
The pack is a CAMELBAK Transformer with a 3 liter bladder. Two sections are removable and there is MOLLE strapping on the main section of the pack. I have added a paracord section to the waist strap, giving me another 25 feet of paracord. Any geocoins, travel bugs and assorted other swag are stashed in the back section for easy access.
With this pack, I just fill the bladder, grab my hiking staff and I’m ready to hit the woods.
The thermometer and tape measure are used for some Earthcaches where temperature and/or measurements are required. You will always want to read through the logging requirements of the caches you are going after to find out it there are any special measurements needed. The only other thing I have come across were a couple of Earthcaches that had you measure the alkalinity of the water using pool test strips.
For urban caches (those just around town), I don’t always take the full pack, but just grab the green canvas bag, a couple of pens in my pocket, (my edc knife of course) and GPSr.