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Tri Clamp This simple device clamps to the seat post instead of the seat rails, and it fits virtually all seat post shapes. No one else makes one like it. Triathletes popularized this behind-the-seat method of carrying water due to their need to hydrate like crazy, since once the bike ride was over, it still wasnt over. Its common to use two reserve bottles behind to dump into the front bar-mounted bottle, the one with the giant straw attached.
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