Trying to figure a quick light weight way to sink brush in a local lake. There are plenty of big rocks along shore to sink driftwood and brush tops that are naturally along the shore. My question is what to use to hold the rocks. I suppose wire around the rocks would work but thought some of you may have a better idea? Using sand bags filled with rocks on the banks would seem to work and be quick but how long would the sand bags hold up? Would like to be something I can throw in the boat that I can run up on the bank and have a top ready in a few minutes to avoid any unwanted attention. Any ideas?