[USMA:29532] Plant soil

[john mercer]

Hi my wife just bought some plant soil today.  It came in 15 l bags.  How do they bag plant soil in the States, is it measured in qts or lbs?  Since soil is solid why wouldn't the bags Doreen bought be weighed in kg? Does anybody know how plant soil in the UK is bagged, in liters or kg or lbs?