Modern Milkman: Reinventing Grocery Delivery by Reintroducing a Circular System

The Modern Milkman in the UK has reintroduced and modernised one of the most sustainable packaging systems: the return and reuse of the glass milk bottle.

Diana Butron

Supported by scientific evidence they have demonstrated the environmental benefits, specifically when compared to single-use plastic packaging.

The Modern Milkman’s customers receive milk and groceries in returnable glass bottles and other reusable containers. The empty packaging is then rinsed and left on their doorstep to be collected, professionally cleaned, sterilised and reused. This system minimizes single-use packaging waste and reduces manufacturing emissions with the reuse cycle.

To evaluate the environmental impact of reusable glass bottles, The Modern Milkman commissioned a life cycle analysis (LCA), by Eleanor Carter, a master student at Utrecht University. This scientific report compares the carbon footprint of returnable glass bottles with the cycles of high-density polyethylene (HDPE) plastic bottles and beverage cartons, including production, cleaning, distribution, and end-of-life scenarios.

Lower Carbon Footprint

The report found that when the 0.5 L glass bottle is reused multiple times, it has a lower carbon footprint than the single-use plastic packaging. The report calculated the times that the glass bottle needs to be used to emit the same amount of carbon than some variants of the HDPE bottle and two variants of the beverage carton, shown in the table below:

(n) Uses of Glass Bottle to Breakeven	Single time Use Alternative
1.4	Carton
4.6	HDPE
1.9	Carton
2.0	HDPE
3.7	HDPE

At the Modern Milkman UK, the current rate of return and reuse for the glass milk bottle is about 81%, with the bottles being reused around 5 times, ensuring the environmental benefits from the circular system. In addition, the more often a bottle is returned and reused, the lower is their overall climate footprint as the production emissions spread over time.

Closed Loop Recycling

Given that glass is made from natural raw materials (mainly sand, soda ash and limestone) it can be recycled infinitely without loss of quality, In addition, it can be remelted and reformed while avoiding leakage of any harsh chemicals or microplastics into the environment, which is not the case with HDPE plastics production and/or recycling. In addition, in the UK recycling infrastructure was found to be a barrier and much of the national waste is sent abroad.

The advantages of using glass – no microplastic contribution, infinite recyclability and consumer health benefits- align with global waste management objectives: reduce waste generation, improve material circularity and decrease reliance on landfill or downcycling paths.

As the system effectiveness highly relies on the consumers returning the bottles on of the study’s recommendation was to encourage consumer participation by introducing a deposit return scheme.

This sustainable business model exemplifies how circular design, consumer engagement and modern systems can work together to reduce environmental impacts.

Sources

Carter, E. (2022). A comparative life cycle analysis of the Modern Milkman’s reusable glass bottle (Unpublished MSc thesis). Utrecht University. https://blog.themodernmilkman.co.uk/wp-content/uploads/2022/09/BND000144_Lifecycle-Glass-Bottle-Report-2.pdf

The Modern Milkman. (2022, September 15). The life cycle of our glass milk bottles. The Modern Milkman Blog. https://blog.themodernmilkman.co.uk/life-cycle-milk-bottles/

The Modern Milkman. (2024, April 15). 100,000,000 reasons to smile. The Modern Milkman Blog. https://blog.themodernmilkman.co.uk/100m-plastic-bottles-prevented/

Modern Milkman. (2025, May 7). Beyond the bottle: How glass packaging is helping fight the invisible threat of microplastics. The Modern Milkman Blog. https://blog.themodernmilkman.co.uk/beyond-the-bottle-how-glass-packaging-is-helping-fight-the-invisible-threat-of-microplastics/https://blog.themodernmilkman.co.uk/wp-content/uploads/2022/09/BND000144_Lifecycle-Glass-Bottle-Report-2.pdf

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