Originally Posted by WestOz
I find it easier to remember to drink regularly with the Hydro pack, and I transfer water out of the bottles into the pack through out the day.
Just sticking the mouthpiece into my mouth is much easier than remembering to reach down and drink from the bottle. Can also do it more steadily during the ride without worrying about whether the water stream squirting down my throat is going to cause me to choke as I inhale while drinking
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Originally Posted by WestOz
I find that your back can get hot with a Camelbak on until you get used to it.
I agree but as cycocommute suggests, dropping ice into the Camelback can make for a pleasant sip of cool H2O in hot weather. But the Camelback is kind of annoying at times. When I first started riding, I wore the Camelback all the time and kept cellphone, keys, etc. in it. Felt funny when I went to the bottles instead because of heat on my back. But then I realized that I wasn't drinking regularly enough with the bottles...