Well I grew up following my grandad around while he did his leech trapping and minnow trapping. What he used is a coffee can with both ends cut out of it and two plastic lids. He would cut a round circle in the lid, about a three inch circle, make a cone out of some wire screen, similar to minnow traps. Staple it to the lid with a stapler. The hole in the end of the cone would be just big enough for a leech to get in. Throw your bat inside the can, since the can has two open ends it will sink on its own. With the screen cones in each end the leeches can enter from either way, but have a hard time getting out. Since the screen will poke them when they try to leave. Worked great, could even check them after sunrise because there was no escape. GoodLuck!!!! ------------------ Rip sum Lips