Camelbak clearly have quality issues with their hydration bladders. The design of the Unbottle's insulating bag is actually very good, but unfortunately the hydration bladder with screw cap is not at all airtight. It flows almost as if there were no seal at all, no matter how hard you tighten it. I had the same issue with Camelbak a few years ago with this newer design and I was hoping they would have fixed the quality issues by now but they haven't. I am currently using insulated Camelbak gusseting chambers, but this is an old design that works well. I sent the Revain bubble back and they promptly refunded my money. I am currently using the Osprey Hydration Bubble and purchased an isolation bag from another seller. I would not recommend this product.
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