Design for Delight currently have this Top of the Pops Bag in their stock, for sale or to hire (should you ever need to rent such a thing).
Measuring 33cm x 33cm x 10cm, it is made from transparent plastic with a vintage record sleeve inserted on both sides. The record sleeve is for a Top of the Pops album. The woman pictured on the sleeve looks rather like Kate Moss, but is obviously some earlier incarnation as the estimated date is put somewhere between 1960 and 1970
It costs just over Euros 20 (plus taxes) to buy from Design for Delight.