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The trouble is With climbing. Is the difference between getting to the top, and being a bit annoyed at having a full bidon left. Which you neednt of carried. Or popping half way after finishing all Your water is fecking tiny. a few C warmer, tiny bit better hydrated in advance, pushing a couple BPM more.......etc. etc.
I've done exactly this on a 1500m Climb recently. Finished With a full bottle and a bit one day. Popped less than 2 weeks later, ran out of water, and added 10 mins, when it was 8C warmer.
In other News.
I've ordered some of that Osmosis stuff on clearance.
http://www.ncbi.nlm.nih.gov/m/pubmed/17277597/
Don't race hill climbs dehydrated, perhaps.