I have 3 narrow 48" buckle straps that I have used for touring for more than 25 years now with no problems. I like straps more than bungees because bungees can let a load loose on a big bump ( I had a nice 35MM Minllta camera pass me once that I thought was secured with bungees). I keep the straps in a pannier when not in use, not on the rack. Thin straps are best because they bite more deeply into a soft load to better securely anchor it to the rack.