I bought two of these traps to catch the fish in my private pond to transfer them to another area during renovation of the pond. I dropped them in the deep area, and the next day I went out in a row boat to retrieve them. They were packed with fish! Very exciting. Unfortunately, after I emptied the first trap with the hinged door, I pulled up the second trap. The hinged door didn't work. It had been fastened permanently shut with clips at the factory. There was no way to get the fish out. I had to pry open the trap (ruining it) in order to save the fish. I'm sure it was a simple mistake at the factory. Nevertheless, I am out one trap. Other than that, their design is great and they really work!