Abstract: A bag assembly (20) comprises a bag (15) having an insert (16) attached thereto. The insert (16) has stowed and operative conditions. In the stowed condition, the insert (16) is accommodated within a pocket (74) within the bag (15). In the operative condition, the insert (16) extends from the bag (15) so that the insert and the bag can be so positioned as to substantially cover the internal surfaces of a toddler seat (114) of a shopping trolley (100), as well as portions of the trolley, including nearby top edges of the basket portion (104) and the handlebar (122) of the shopping trolley.