Charlie has now got the blackberry bug.  He is on his own, presumably because it is a Wednesday and his friends should all be at work !  From somewhere he has the notion to take with him a large cardboard box (no plastic bags in those days) in which to collect his favourite fruit, but then comes unstuck with a brown paper bag.  Just a come day, go day potter gathering several pounds of blackberries and only covering 85 miles.  Only 85!