Every layer of PVB film rolls is separated by PE film, vacuumed by aluminum foil and put into wooden cases. The finished qualified product is enclosed with the conformity certificate, packing list etc. Take PVB film size 0.76mm x 2440mm x 400m for example, it's case size 2.52m x 0.52m x 0.54m, and a 20' container can hold 24 cases.