Maybe, but for me it is usually only one piece including the bike with panniers because I usually do not take them off the bike at all during a tour. I think that in 73 days of the TA I took them off once to leave the panniers in a hosts garage and again at the end of the tour when we were staying with friends for a few days and they shuttled our gear. On my other tours I don't think I removed the panniers even once until the end of the tour.

Edit: The handle bar bag is an exception since it generally stays with me at all times.