Packaged well. Even though the bottom was blown out of styrofoam cooler and box was wet, I could still feel that water was present. Turns out probably a box near by had sprung a leak and just got mine wet. It was taped well so bottom of box did give way even when soaked. Very impressed with the rock and will be ordering more in the future. I highly recommend the shipping in water. No cycle and everything is living great. Sea stars (brittle) crabs pistol shrimp. 4 colors of coralline and beautiful sponges. Thanks KP! Very impressed!!