OK, in all seriousness, what you usually see is a water bottle hung from a daisy chain with a "toy" carabiner, or, if the wearer wants to look really macho, a real live locking 'biner. I think that some people, both manufacturers and consumers, think that daisy chains look cool, or "tactical," which is apparently the newest fad word sweeping the country. Personally, I don't like a bunch of junk swinging from me, or my gear. High and tight is what I like. Hey, I'm a poet and don't know it...
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OBG