The Bionic Bait Chum Bag is a must when it comes to chumming. Put your chum block like the Bionic Bait Menhaden Chum inside your chum bag. After that, hang your chum bag filled with chum off the side of your boat. All you have to do after that is wait for the chum to dissolve and the fish to rise off the bottom! The Bionic Bait Chum Bag Small Hole is for slowly chumming the waters you are fishing. The smaller hole design allows for a slow trickle of bait. The Bionic Bait Chum Bag Large Hole is for chumming the waters at a quicker rate. The larger hole design allows for larger chunks of chum to be released.