My bike only has room for one bottle, and a standard cycling bottle doesn't hold enough water to sustain me for a long ride. I used to carry a 48oz Nalgene Silo in a sling bag, but this bottle cage frees up space in my bag and gets the weight off of my back. My Nalgene fits like a glove, without any rattling during my rides. Yes, this bottle cage is expensive, it is s well worth the money if you want to carry a Nalgene with you on your rides.