Funny, as another person mentioned I also run the patched tube and only carry new tubes in my bags. A patch can fail if it's not done well, something I don't want to find out after the tube in my tire also has a hole in it.
Something I see very rarely so I always mention it: the spare tubes I carry are wrapped in duct tape or masking tape. This prevents them from wearing holes in the corners as they vibrate around in your bag. I get so few flats that a spare tube might be carried around for a year or two and many thousands of miles. The last thing I want is for it to be full of holes and completely useless!