For carrying and storing 6 by 8 paintings. Very lightweight. Constructed of sturdy 3mm corrugated cardboard with an "angular channel" design in polystyrene to protect the edges of your artwork. Each box holds two stretched canvases or four panels. Perfect for keeping your plein air paintings dust-free while drying or in storage. Sold in packs of three, these convenient wet painting carriers are shipped flat with instructions for easy assembly.