I'm a big fan of the Third Hand Rag Bags. I recycled a cheap bag target into one of the rag bags and added a little more in the way of rags, and it works great. I made a pvc form to hang it from. The rag bags seem to be tougher and don't show holes as quickly as other bag targets. I leave one out all year, and they don't seem to degrade under UV light like some others do.
I also use a block and have them set 10 yds apart so I can vary my distance a little easier every time I shoot.