I'd have to say it would be my wading staff. With a bad knee like I got, I'm always paranoid of slipping on a slimy rock! It would definantly ruin my day/week/month... if I did! Since I got the wading staff, i feel a little more confident. It's just having that something there to lean on that makes the differance I guess.
"To go fishing is the chance of washing one's soul with pure air, with the rush of the brook, or with the shimmer of the sun on blue water."
- Herbert Hoover, devoted angler and thirty-first President of the United States.