Fold away large camping bag (S20 Waterthorpe)

Hi, large bag that folds away into a small zip up bag.
It's hard to show how big it is, so I have put 3 full size sofa cushions in just to show the size. (Cushions not included).
Pull up cord around top and shoulder straps. No other pockets on it. I assume it is for camping/sleeping bags etc.
Never been used, only opened for photos.
Collection only please.