If you want to carry a lot of gear, trailers work. But they are pretty hard to pull, especially on climbs, soft ground, or technical singletrack.
If you want to carry a fair bit of gear, but not tons, panniers and a rack work surprisingly well, even on technical terrain. Just make sure that you get a heavy-duty rack, such as the type that Old Man Mountain makes.
If you don't want to carry much gear at all, rackless seatbags and handlebar bags are the way to go. Lightweight, and low-bulk make for fun riding. List of bag makers:
http://forums.mtbr.com/bikepacking-bike-expedition/bikepacking-gear-bags-who-makes-em-766873.html