I ride with a waistpack. You still have to worry about the bag twisting around your waist, trying to get something out of the waist, i.e. keys and it can be too heavy. There are positives and negatives to any method of carrying items. So far I have used a trailer (good for large items) panniers(one of the bags kept slipping off until it damaged my wheel) back packs (I have a bad back) I am still looking for something to use when traveling.

Gas, .69 cents, the price of a can of beans.