I don't have a rack for my canner either, but another way around that is to take a small clean towel, wash cloth, dish rag etc and place in the bottom of the canner and then sit your jars on it, I have only had one jar break in the canner, and I am sure it was because it was not a regular canning jar, so with regular canning jars you should not have any problems. Also if you do not have enough jars of what you are canning to fill up your canner...just add a few extra empty jars (with no lids)full of water to keep jars from jiggling around to much and you should have no problems.