The Evening Woodworker - This is the simplest plywood storage rack you're gonna find that won't break the bank to use or make you use all of your plywood to store... plywood.
Image result for 4x8 panel storage | Lumber rack, Lumber storage, Wood storage rack
EASIEST DIY Lumber Rack -- Made from Basic 2x4s!
Space Saving Plywood Rack // Workshop Organization - YouTube