LoDown has been impressed by ParknShop's superb staff training and environmentally friendly policy. It has been offering customers a rebate for using fewer plastic bags and promoting sales of its 'eco-bags'. But our good impression was shattered when a Post colleague went to a Sai Ying Pun branch of the supermarket chain yesterday and asked for an eco-bag. The cashier promptly handed him one - wrapped in a plastic bag. It didn't appear to be an ironic gesture. Perhaps the cashier had been instructed to offer customers more choices of carrier.