'Litre'l Thinking

Thanks to the liquid bomb scare at Heathrow airport a few months back, my cabin baggage which has clocked up many frequent flier miles can no longer dream of seeing an overhead compartment ever again. So, I was shopping today for a rollercase that met the 36x24x36..sorry 56x45x25 (cm)..requirement. I was appalled to know that I had to either carry a portable microscope to read the dimensions printed on the luggage tag or carry a tape measure, and I had neither. However, the volume of the rollercase was printed on the tag with such large font that I could have read it from the cruising altitude of a 747, typically 32000 feet I think. My grandma with cataract could have also very clearly read 56 Litres, 43 Litres, etc printed on these roller-cases, again from the same cruising altitude. When I go shirt shopping, I am ever so careful to buy only the ones less than 100ml. Gee! I cant believe they forgot to provide a nozzle. How am I going to pour my clothes into the rollercase?
Don't these manufacturers know that liquids are not allowed on board any more? If they did, the outer shell would be in clear plastic to zip past airport security.