Pockets. That takes care of the wallet, change, Swissknife, applicable medications, writing implement, and tape measure. A key to the trunk of the car attaches to a belt loop, and my key ring goes in the trunk of the car. If I am carrying the computer, it fits into a little fleece bag that suspends (by two carabiners) from my belt loops. If I am carrying the video camera, it fits into a little tiny waist pack which also has a shoulder strap on it because I don't trust the belt buckle. If I am carrying the 35mm SLR, it comes on a purpose-built 3-point suspension harness. I don't like hats, the good Lord provided me with effective natural sun protection, I don't carry a canteen, and although I should, I don't own a pair of sunglasses (I keep saying my next pair of glasses is going to have a photo-sensitive tint), but I do have a neck cord for my glasses which I only use if the park insists on it.
--Dave Althoff, Jr.