Bike camping is fun, did it lots when I had the concours. Like anything else, when you get serious about something, there's lots of specialized gear you can get - there's a plethora of lightweight camping gear available - if you wanna spend the cash. I'm leaving on a 7 day BWCA trip in the morning and my total gear loadout is 70L and weighs just over 60#. (the tackle box and rod&reel are not counted in that total)
that's a mess kit, stove, fuel, lantern, flashlight, tent, sleeping bag, 2 changes of clothing, rain gear, 14 meals (planning on some fish...) 100' of rope, roll of duct tape, axe, saw. & couple other various essentials. The only thing not in my pack is water. I've got filters and sterilizers for that.