According to Lin, producing a completely hand-made bookbag is an extremely labor-intensive process. Back in the days when all the sewing machines were treadle-operated, a highly skilled craftsman could turn out no more than 20 bags per day.
林芳洲指出，純手工製作的帆布書包，是極為勞力密集的工作，在過去那個只有腳踏裁縫車的年代，一個技巧純熟的師傅，一天最多也只能製作 20 個書包。