Cinder blocks weigh between 35 & 38 lbs each. I would look at a metal sleving unit you assemble with a screw driver if it will fit in your closet. Lowes or home depot sell gorilla (or other brands) shelves that will hold 300# per shelf and are 30" wide. Usa a hammer to assemble. Harry's idea is good if you have a drill to use as a screw driver. If you want to use NokomisNims idea the box stores will cut plywood into board size pieces for you very cheaply ... View related article.
