Although I cycle tour with a pack, its always a good idea to get some dense and heavy items strapped to the bike. I'm not a fan of panniers, trailers and even handle bar bags - they all adversely affect the handling of the bike for serious off-road riding.
One item I wanted to get out of my pack and onto the bike was my Tarptent Stratospire 2 tent. Even though it weighs less than 1.4kg, its nice to be able to get that off your back.
There are a number of great commercial designs for saddle bags, but I didn't have time to order one for an upcoming tour, so I decided to make my own.
Here's what it looks like on the bike:
Here's the bag and tent:
Here are some things I like about this setup: