FireKing 3-2131-C SF, Fireproof Safe in a Fire File Cabinet, make it waterproof with DRYFiles bags!
Fireproof File Cabinets, Fire Resistant File Cabinets in Stock - ULINE
VANCORE Fireproof Document Box with Lock, Collapsible File Organizer Bag Waterproof, Portable Home Office Safe Filing Box Storage Bin with Handles for Letter/Paperwork/Passport - Walmart.com