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You could wear a hidden pocket, travel or money belt (some of which are waterproof). Depending on your accommodations during the trip, consider those that offer in-room safes and, if not available in room, check what βbehind the deskβ storage provisions are available. Many hostels offer lockers; if you havenβt brought your own padlock, some have them available, or buy one locally. Another option might be private security box or deposit box rentals, not affiliated with banks. A Google search for Mexico City returned SwissBoxes or StrongMax.