Advantages & Disadvantages Glass Milk Bottles

Advantages & Disadvantages of Glass Milk Bottles

Many of us will still remember the days when we used to be able to purchase milk in glass bottles. In fact, that sound of the milk cart powering up the street and the clinking of bottles is synonymous with bygone decades. However, times have changed and plastic is now the preferred way to store milk.

Despite this, glass milk bottles are experiencing something of a surge in popularity again. There are many reasons for this, from environmental concerns to nostalgia. Which is better? And which is less damaging to the environment? Let's take a look at the advantages and disadvantages of glass milk bottles.

Why Did Glass Milk Bottles Almost Disappear?

In the not too distant past, glass milk bottles almost disappeared. People once relied on bottles of milk delivered daily to their doorstep. At this time supermarkets had yet to corner the market or require mass production of milk to stock their shelves of convenience. Customers also enjoyed the freshest milk possible delivered straight to their door.

However, times change and so has consumer behavior. In the 1980s, around 90% of the milk consumed in the UK was delivered in glass bottles. Just a few years ago this stood at 3%. It looked as though doorstep delivery was dead with the glass milk bottle suffering a similar fate.

There are two reasons for this.

The first being the supermarkets. For years they have squeezed down prices paid to farmers and manufacturers whilst increasing mass production to satisfy our weekly shops. To ensure they were able to sell milk as competitively as possible cheaper to produce plastic bottles became the norm4. They were also lighter and suffered from fewer breakages making them perfect for the high volumes of milk sales supermarkets began to enjoy.

The second and related reason being shifting buying habits. As more people shopped at supermarkets for their weekly needs milk delivery services began to experience less custom. Our busy lives have led to more convenience shopping at all hours of day and night. The idea of always remembering to put out old glass milk bottles and collect fresh ones at a set time each day for many is no longer actually convenient.

Subsequently, many milk delivery services were no longer economically viable. As a result in the UK the then biggest glass milk bottling plant, owned by Dairy Crest, faced closure due to the growing consumer preference for plastic bottles.

Something of a resurgence

Fortunately, in 2015, Müller, a competing dairy company, decided to invest, and with that came growth in Milk & More, a modern milk delivery service where consumers can place their orders online. Further, the service also offers other groceries such as butter and eggs. It has now become the largest milk delivery service in the UK.

A similar service exists in the US called ‘Drink Milk in Glass Bottles’. Another example of a service in resurgence that had started to disappear.

Office deliveries have also become a growth area. Due to higher volumes and higher concentrations of offices in any one area services can deliver more profitably. As such, today we can see more office fridges stocked with glass milk bottles.

So whereas most of us still buy our milk in plastic bottles from the supermarket options for glass bottles still do exist. With this in mind, are they better than plastic?

The Advantages of Glass Milk Bottles

Glass Milk Bottle
Photo by ROBIN WORRALL on Unsplash

Reusable

The biggest advantage of glass milk bottles is that once we’ve consumed their contents they get returned for reuse. Once returned glass milk bottles are washed and refilled and sent back out to consumers full of fresh milk. Whereas there are transport considerations to take into account, avoiding the production of a new plastic bottle for every milk purchase is a win for glass.

Require Less Energy Per Use

When it comes to whether glass or plastic bottles are better we actually have quite a lot to consider. Glass typically takes twice as much energy to produce and therefore during production can actually generate more C02 than plastic when compared by weight.

However, this is just at manufacture, if you average out the additional energy requirements across the lifecycle of a glass milk bottle that gets used again and again the winner is glass over plastic every time.

Glass is Recycled More

The Container Recycling Institute has found that plastic bottles are recycled at a rate of 29%. In comparison to this, glass has a recycling rate of 37%.

Further, as far as plastic goes, there are many vagaries when it comes to recycling5. Different types of plastic waste can vary in their recycling. Whereas most curbside collections do take plastic milk bottles, what happens once collected can vary considerably due to the capacity and ability for them to be processed once collected.

What's more, despite many doing their best, a great deal of the single-use plastic we use ends up in nature. Plastic that enters the sea or landfill will take hundreds of years to break down1. When you consider that 91% of plastic isn’t recycled, it has to end up somewhere.

Further, plastic that does get recycled tends to be downgraded into lesser items. For example, you’re more likely to find recycled plastic milk bottles in plastic outdoor furniture than in another food-based application. As a result plastic milk bottles will most likely be “new plastic.”

Glass, on the other hand, has more of a conscious element to it. Glass breaks easily when thrown away and is heavier, both of which people are aware of. As such, consumers seem more likely to carefully recycle a glass bottle than a plastic bottle6.

Meanwhile, glass milk bottles not sent back for a refill and at the end of their useful life are 100% recyclable and we can recycle them over and over again. What’s more, glass has a quick turnaround when it is recycled. Once consumers recycle it, it can be reused again within 30 days.

Better still, recycling glass produces less CO2 emissions and consumes less energy than new plastic3. This is largely down to the polluting resources required to produce new plastic and that plastic recycling requires more complexity and processing and accordingly higher energy use.

Safer

When it comes to storing and consuming milk, glass milk bottles are safer. Plastic milk bottles come with a number of risks including chemical leaching2. This means that chemicals can leak into the milk and pose health risks.

Glass milk bottles do not come with the same health concerns. We make glass with natural materials such as sand and limestone. What’s more, it is the only packaging that the FDA classes as fully safe.

Due to its natural composition, glass is chemically inert. This means that it does not consist of reactive chemicals.

Easier to Use

Let’s face it, consumers love simplicity.  Plastic milk bottles can leak from the lid when squeezed. We’ve probably all suffered a leaky plastic bottle from time to time.

Whereas a glass bottle retains the same shape and won’t leak when crushed at the bottom of a supermarket bag under heavier items. They’re also more robust and sturdy to hold, of course, you do need to keep them upright.

The Disadvantages of Glass Milk Bottles

Glass Bottles Are Fragile

We all know just how flexible plastic bottles are. While glass is undoubtedly strong and has the ability to safely store content, it is also fragile. Any kind of impact can cause the glass to break and this instantly means that it is useless. What’s more, it means that the contents will also go to waste.

Glass is also susceptible to sharp changes in temperature. Therefore, a glass milk bottle left on a doorstep can shatter once it is met with warm temperatures.

Heavier

When we compared to the thin plastic milk bottles we have become accustomed to, there is no doubt glass is heavier. As a result, its weight adds to the cost of transportation. Also, it means that consumers will have to the price as well as the environment due to the emissions from transporting the bottles.

In this respect, alternative containers such as cardboard or even plastic are a more favorable option. In some instances, manufacturers have attempted to use thinner glass. However, this brings with it a range of other issues.

Glass Can Be Unsafe

A simple accident can cause the glass to shatter and break. This makes it more dangerous than plastic. With shattered glass comes the risk of cuts and what’s more, the broken pieces can also find their way into other bottles if damaged during the manufacturing process.

At any time during the entire process, from manufacturing bottles to filling them to transporting them and even handling by consumers, the glass can pose a safety risk.

Diminishing Freshness

Of course, having a milk delivery will ensure that the milk is as fresh as possible. However, traditional glass milk bottles come with foil tops. Exposure to air can reduce the shelf life of milk once a seal gets broken. Plastic bottles can come with lids that we can re-seal. This ensures the milk can remain as fresh as possible.

It is possible to put lids on glass bottles. However, this would require the use of other materials and that can have a cost implication as well as an implication on the environment if the lid is made of plastic.

Further, the wholly transparent nature of most glass milk bottles can result in the degradation of milk when exposed to light. The slightly translucent plastic alternatives offer a slight advantage here. Of course, it's not too much of a problem as most of us safely store our milk in the dark of the refrigerator.

Will We Keep Seeing a Resurgence in Glass Milk Bottles?

Milk Man
Will we see more trucks like these on our streets delivering glass milk bottles? Photo Credit: Johnny Huges on Flickr CC-BY-2.0

With the advantages and disadvantages clear to see, we have asked whether glass is a feasible option for transporting and storing milk?

The environmental advantages outweigh the disadvantages which is certainly a positive thing. What’s more, the resurgence in the use of glass milk bottles proves that people are now thinking and buying in a more environmentally conscious way.

More and more of us no longer want to purchase milk in plastic bottles. As we increasingly look to alternatives to plastic we’re likely to see more glass used. Therefore, it should only be seen as a good thing that glass milk bottles are making a comeback.

All the same, until supermarkets can find a way to produce, transport, and reuse glass milk bottles cost-effectively plastic will continue to be their de facto choice. The more of us that switch to glass the more likely it is they'll look to proactively move away from plastic.

From being kinder to the environment to reducing plastic waste and even being kinder to our bodies, glass bottles seem to be a better choice all round. 

1Ioakeimidis, C., Fotopoulou, K., Karapanagioti, H. et al. The degradation potential of PET bottles in the marine environment: An ATR-FTIR based approach. Sci Rep 6, 23501 (2016). https://doi.org/10.1038/srep23501
2Environmental and health hazards of chemicals in plastic polymers and products. Lithner, Delilah. University of Gothenburg, Department of Plant and Environmental Sciences
3Andreas Schmitz, Jacek Kamiński, Bianca Maria Scalet, Antonio Soria, Energy consumption and CO2 emissions of the European glass industry, Energy Policy, Volume 39, Issue 1, 2011, Pages 142-155, ISSN 0301-4215, https://doi.org/10.1016/j.enpol.2010.09.022
4Supermarkets, Stop the Gouging - Milk Prices Should Tumble $1. The University of Connecticut. 10.22004/ag.econ.169455
5W. Mack, "Recycling Plastics: The Problems and Potential Solutions," in Disposal of Plastics with Minimum Environmental Impact, ed. H. Mackinney (West Conshohocken, PA: ASTM International, 1973), 3-16. https://doi.org/10.1520/STP38581S
6Robert Ball, Shirley M. Lawson, Public attitudes towards glass recycling in Scotland, Waste Management & Research, Volume 8, Issue 3, 1990, Pages 177-192, ISSN 0734-242X, https://doi.org/10.1016/0734-242X(90)90062-R
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