You will find commercial handles which have been alleged to make carrying plywood easier, but they're not inexpensive. The only way I have carried sheet merchandise is with a loop of rope caught to the corners. e.g. Orange demarcation fabrics may also help to stop damage to archaeological internet sites. https://nylonwebbingnet59269.isblog.net/5-simple-statements-about-lifting-plywood-explained-51632155