Paper lolly bags with a rock in the bottom, berley thrown in thawed out and refrozen so when you biff the bags out the paper slowly breaks up and they sit on the bottom thawing out releasing bits, plus you can throw them all over the show and get good distance out of them.

buy some 80mm pvc pipe cut into sections about 100mm tall sitting on a board or in a container in the freezer throw a small rock inside and fill to the top with some thrawed out berley and pack the tubes untill full. When frozen whack them on the ground to pop them out the pipe and you can throw them a good distance and can make heaps up out of the standard 1.5kg berley bombs.