I did a self-supported kayak-bike trip a couple of years ago, the gear I needed for that was somewhere in the 70kg (155-160 pounds) range. A bit over 600 kms on bike. It's OK as long as one is not in a hurry.
--J
[edit] Forgot about the setup: bike, kayak trailer in tow, two rear panniers. Bulky stuff (such as tent) went inside the kayak. [/edit]