most of the time i use my recliner for rear support
...... oh you ment for a rifle. I have a couple of different ones i use. I have sandbags but they are not good for packing around too heavy, i have a set of bags that i bought from wally world they are pretty good and not too heavy. My most recent thing that i use is a sewn up bag and stuffed it with socks. Very light weight and conforms to the stock and can be puffed up or flattened out as needed.