I have been using burlap potato sacks for the last few years. They seem to last a long time and give a fairly cool smoke. You cut them into strips about a foot wide , fold into three and roll them up into a bundle that fits into your smoker. I get them from the local potato growers co-op for about $.25 each. Previously, I used planer shavings with good success. The sacks are less messy, burn longer, and produce less waste. After use, I dump the remaining burlap into a (clean) paint can and put on the lid. The remnants can be used to start the smoker next time. Donald Aitken 11710-129 Street Edmonton Alberta Canada T5M 0Y7