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The push-and-turn mechanism takes some getting used to, but now I actually feel confident tossing my fuel bottle in the pack without worrying about a leak. It clicks into place with a reassuring solidity that the original cap never had.

Snapped it onto my MSR bottle last night and the click it makes is so reassuring—definitely a tighter fit than the stock cap. Won't have to worry about my kid getting into the fuel when we're camping anymore.

Does exactly what it says—the locking mechanism requires real pressure to turn, which took my 4-year-old a solid minute to defeat. Only gripe is it's a bit stiff for adult fingers too, but I'll trade that for peace of mind on a shelf.