The craft and the ride
A chest boat is any boat + a chest crafted together (five planks around... practically: craft a boat, then combine with a chest). It sails identically to a normal boat and opens a 27-slot chest on right-click — even while a passenger rides. It is the overworld’s answer to the mule: move a whole mining trip’s haul in one trip.
Logistics patterns
Base-to-village trading runs, mansion expedition hauls, and ancient-city loot trips are the classic uses. On ice roads the chest boat still hits highway speed. Paired with a chest-minecart rail line at your destination, you can move bulk goods across the map without a single inventory-management pause.
Care and feeding
The boat breaks on hard impacts and drops both boat and chest with contents intact — nothing is lost, just scattered. Carry a spare boat (one extra planks set) on long river journeys, and remember the chest boat cannot fit through 1-block gaps like an empty boat can.