Sainsburys used to sell milk in a bag with a jug to transfer it to but havent seen them for some time,but then again havent looked,.so perhaps that is the way forward instead of a bag of peas you get a bag of milk,.
4 pint semi skimmed now £1 in most supermarkets, no wonder the old milkman has virtually vanished. Up until a couple of months ago my sister in law had 3 pints a day delivered but it went to 42p pint so she stopped and went to Tesco 1/4 mile from her house to get it.