I am very protective of "my" cart. It actually belongs to the City of Ann Arbor, but I am on that vehicle almost every single day. I also have a habit of trying to carry many tools and other items that I might need in a day. Trying to take care of 130 acres of grass can put me up to three quarters of a mile a way from the shop, so in order to save travel time, I carry a lot of "junk" with me at all times. Every thing I have with me, I have used more than once. Here is what was on my cart today.
Starting from the bottom-left, coffee cup (super important), two-way radio, ready-to-use spot weed killer, swiss army knife, white turf paint, multi-tool, tape measure, adjustable wrench, soil thermometer, needle-nose pliers, utility knife, screw driver with interchangeable bits, rope "fib" (allows you to secure rope to itself with out knots), golf multi-tool with ball mark repair tool and soil probe.
Next row from the bottom, starting at the left, garden pruners, water-proof notebook, flashlight, pen, on/off key for Toro irrigation heads, irrigation tool for taking apart irrigation heads, wire brush, hollow-braid rope, marking paint wand with yellow turf paint, business card holder, "Stimpmeter" (used in conjunction with golf balls and measuring tape to determine green-speed), Teflon tape, electrical tape, o-rings for irrigation heads, ballwasher wrench, ball mark repair tool, golf balls, towel.
Next row, grass trimmer, hose nozzle, spigot for tapping into irrigation system, "quick coupler" for tapping into irrigation system, irrigation flags, 75 feet of 3/4 inch hose. Not shown in the picture is the camera that I took the picture with and the 2-way radio that I use to program the irrigation system.