Shape classification
Round cans, rectangular cans, square cans, hand push boxes, shaped cans (heart/oval/car/cartoon animal shaped) ...
Use category
Tea cans, coffee cans, chocolate cans, biscuit cans, mooncake boxes, music boxes, cd boxes, hand cans, lunch boxes, piggy banks, cigarette cases, stationery boxes, table boxes, wine cans, gift cans, tissue cartons, candle pots, metal barrels, metal trays, billboards, badges, coasters ...