Inexpensive surplus military ammunition containers are ideal for such storage. They are designed to remain totally submerged for days without leakage. On ocasion there are storage containersn for medical supplies or electronic gear that show up in surplus outlets. All of these have an elastomeric seal and a leveraged compression seal that totally seals the container. If one intends on keeping documents in a sealed container look for a dissicant packet to absorb moisture to place inside.
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