Needs a redesign.
Good idea but a poor design. Mine only sealed out water for a few days of use. The plastic is very brittle and has deteriorated so that is likely where water leaks to the inside. It is also impossible to open without a knife to wedge it open. I use if for surfing under my wetsuit so there is little water pressure on the seal. I even tried sealing it with silicon grease but still some drop or two get inside and condense. A better design would have a rubber gasket.
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