Much of the packaging of shop goods in my 1940s childhood was little different how it was in the early 1900s, as described in my mother's recollections of shopping in the early 1900s. The main difference was that more goods were arriving in the shops ready-packaged, although this was still on a very much smaller scale than today.
Pre-packaging was mainly in tins, glass and stone jars, and there were far, far more lidded tins around than there are today. It was never difficult for my friends and me to get hold of an empty and reasonably attractive lidded tin for craft or to store trinkets. The disadvantage of those tins, though, was that the colourful outsides did scratch easily. My fancy-dress top-hat for the World War Two street peace party was made from a custard tin.
Not shown in the above picture are milk bottles, presumably because milk was perishable. Milk bottles were always made of glass.
Liquid poisons were always sold in ridged glass bottles, so that even blind people could tell that they were poisonous. The bottles were usually either green or brown. I understood that anyone could buy poisons as long as they signed a poison book, but there may have been restrictions that I didn't know about.
Many goods were weighed or measured out and wrapped specially for every customer, just as they had been for years. Biscuits, for example, were sold loose for much of my childhood. This presented problems because they broke easily while being weighed out and in the paper bags on the way home. In fact broken biscuits were sold off cheaply. It was very difficult indeed to keep biscuits crisp because they were continually exposed to the air in the shop before we ever got them, because the large supply tins had to be opened every time customers bought biscuits.
Paper bags were the norm for packaging, and they came in several sizes, sometimes with the shop's name printed on the front. There were white ones and brown ones. A wad of them hung on a string and were torn off as required. Paper bags had a very limited life. They disintegrated if they got wet, either from holding damp produce or from rain, and they crumpled easily.
Boots the chemist wrapped goods up in brown paper parcels, tied with string. This was extremely labour intensive, and was still going on in the late 1950s when I had a holiday job there.
The lack of packaging in shops gave rise to something I recall with nostalgia from my childhood. It was the smell of shops: A grocer's shop smelled like a grocer's shop, a greengrocer's shop smelled like a greengrocer's and so on. The reason was that the food was open to the air. With the advent of almost entirely pre-sealed packaging in the 1950s and 60, all those wonderful aromas disappeared - and along with them, the individual character of the shops.
Chemists made up doctor's prescriptions themselves. Pills were packaged in small brown glass bottles, and liquids in larger brown glass bottles, invariably labelled as 'the mixture', whatever happened to be in them.
When shopping baskets got overfilled, there were no plastic bags tucked away for emergency use. The answer was string bags. They were made of ordinary brown string woven into a fairly large open net with a string handle which didn't take up much space in a shopping basket. Being brown string, they always looked rather dirty and were accordingly popular for carrying vegetables, which were never sold ready-washed. Potatoes and carrots were the worse offenders. We always had to wash them at home before peeling them, and the water ended up black and gritty.