Insulated water bottles, are they worth it?

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My wife dragged my ass to a big box store and as I always do, I hit up the bicycle section to see what kind of crap they sell. Well, this time an insulated water bottle caught my attention and for about 8 bucks I said why not. So then it occurred to me to do this extremely unscientific test to see if the bottle actually works:

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I grabbed 20 ice cubes (chips?) from my fridge and placed 10 in the insulated bottle and 10 on a non-insulated bottle, I then proceeded to fill both bottles with water and placed them outside in 80 degree heat.

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It took 40 minutes for the ice to melt in the non-insulated bottle, I also checked the insulated bottle and it still had plenty of ice left.

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The ice lasted 18 minutes longer in the insulated bottle and it kept the water cool another 20 minutes, not bad! There is one drawback though; if you notice, the insulated bottle is significantly bigger than the non-insulated bottle yet they both hold the same amount of water.

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