analog archival blue-and-white card data-storage documents durable enlargement fiche file files filing film flat-sheets grid-pattern magnification magnifier microfiche microform microreproductions miniature miniaturization miniaturized minimization negative pages photographic-image polyester pre-digital printed-information printing reading record recorded records reduced reduction retrieval saved small small-sized space-saver storage storage-efficiency storage-space thin transmission transparent transparent-film billies billy conserved-heat container convenient cooking-device durability economical efficient fuel-minimises fuel-minimizes handles heat-loss-minimised heat-loss-minimized heat-retention ice-cooler inner-pots insulated insulation keeps-flavour less-evaporation lids non-electric pan picnics portable portable-oven pot pots retained-heat retains-nutrients rice-cooker safe safer sauce-pan slow-cooker spill-proof stainless-steel strong thermal-cooker thermal-cooking thermal-insulation thermos-vacuum travel vacuum-cooker vacuum-flask water-saver zero-energy-use blue bushes ice lawn sky snow trees white