There are many ways to make a crawfish trap, but I simply make them using rope, wire, and mesh cloth. Create a box with an open top that has sides that are two inches high. Secure the sides using the wire. Finally use the rope to tie to all four corners of the box so that you can raise the trap. Tie your bait to the center of the inside of the box and lower it into the water you are fishing in. Wait 30 minutes, and then pull the trap. You should have crawfish clinging to the bait.