The Uniform Packaging and Labelling Regulation has allowed for metric only label displays for quite some time now, (since 2000, in fact). However, I have yet to see items which take advantage of using the metric only option. Motor oil companies, such as Mobile 1 are allowed to use liters vs quarts for oil package sizes. However, labels still display "1 US Quart, 946 mL". In Canada, this bottle is merely stripped of the quart label, leaving the 946 mL label intact. The extra costs of dual labelling and removing labels, I find to be unnecessary especially since this particular item is allowed to use metric only in the US. A suggestion I have for manufacturers who label UPLR covered goods in rounded imperial and unrounded metric units is to understand consumers knowledge of metric. Liters and grams are commonly understood SI units in America, and thus it would be beneficial to both the consumer, and to the manufacturer in terms of cost and understanding to use metric only. I also recommend writing to companies who do not take advantage of the UPLR metric only option, to politely encourage them to use SI only. Something as simple as a nice letter can make a big impact. It does not hurt to try.