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Title: Good overall, but problems with lids
Review: I bought two 18 oz Kanteens, one with a loop lid and the other with a flat lid. Though the Kanteen is a good size and easy to hold and clean, the lids have been a problem. The flat lid doesn't always feel like an air-tight seal, probably because of the metal-on-metal connection. It is, however, easier to open than the loop lid, which is very difficult to open unless you have very strong hands or a screwdriver handy.
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