I bought this particular flask because it was similar enough to my previous "heirloom" from a million years ago to try. The rubber is much softer so doesn't seem to be getting as reliable, but the two times I've used it it ended up working with just the usual amount of water running all over the place. So bottom line: Functional (unlike many others that can best be described as decorative), but not "wow". I would probably buy it again because none of the others look like it's worth trying.
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