Great for moving, storing or shipping large picture frames, paintings, mirrors and any large, thin item. Typically, each heavy-duty frame box should handle two or three paintings, pictures or mirrors. Moving tip: the best way to protect your paintings, mirrors and pictures is to cover each corner with bubble wrap, secure the bubble with packing tape and place the item in one of a frame box. For extra security, fill the voids in the frame box with packing paper.