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I use camelback insulated. They work ok here on warm days. Fill them half way, freeze top up with water and ice.
Lasts about 2 or 3 hours at 30 Celsius.
My normal bivo bottles are very easy to drink from, but are really loud on the bike. They rattle in king cages. I've tried freezing them, but the issue is the straw gets in the way making it difficult to top up.
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