Have you been diagnosed with hyperhyrosis? I've done a good bit of organized long distance riding. Even the heavy sweaters with whom I've ridden don't carry more water than do I: one bottle and a 70 oz. Camelback or only 2 bottles, even in hot weather. One has to stop about every 50 miles to pee anyway, so there's no reason to carry more water than 50 mile's worth. The hottest pass climbs I've done were 105° at the bottom.
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