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How do you calculate sustainability?
How do you calculate sustainability?
How we calculate pieces of plastic and the amount of C02 saved.
Carly Buck-Barrett avatar
Written by Carly Buck-Barrett
Updated over a week ago

We exist to help our customers reduce the amount of packaging waste they throw away or recycle, so it's important to us that we measure our impact and communicate it transparently and openly.

We've measured our impact in 2 ways:

  • Pieces of single-use plastic saved

  • CO2 emissions reduced

How we estimate plastic savings

On average, each Refillable product saves 2 pieces of single-use plastic for each use. We define '1 piece of plastic' as an avg. 6.5g plastic food bag (think a 500g bag of pasta).

Why 2 pieces of plastic for each pot? For each of our Refillable products, we’ve recorded the number of single use plastic bags required from a supermarket's own brand to match the weight of our own products.

Some foods are a simple swap. So 1 Refillable container of 500g of penne pasta = 1 piece of single-use plastic containing 500g of penne pasta.

Other foods are less straightforward. 1 Refillable pot of 500g sunflower seeds = 5 pieces of single-use plastic containing 100g of sunflower seeds each.

Using these numbers we were able to calculate an average of 2 pieces of plastic saved per Refillable item in our range.

Not all of the products we compared are in plastic single-use packaging, there are also some items that come inside a cardboard box, such as cereals, or in glass bottles - such as herbs. Any extra packaging or different material is also taken into account when calculating savings.

How we calculate CO2 saved per item

With the weights and quantities that we found through the packaging comparison, we are able to also make accurate CO2 emission comparisons between our containers and the emissions associated with single use packaging.

All of our emission work uses the government advised conversion factors. This allows us to calculate the emissions associated with the materials. For this comparison, we assume a transport emission amount for materials such as cardboard, glass, and metal which is the same as transporting one of our pots to a customer.

We are able to compare the emissions from 1 use of our reusable pots with the single-use packaging required to match the product quantity. From this comparison we can find the carbon saving specific to the purchase of each Refillable product.

Per order

We measure CO2 emission savings by calculating the reduction customers save by using our service. We compare this to similar eCommerce grocery businesses that use cardboard boxes to deliver orders and single-use plastic to package items.

We estimate our total reduction impact by estimating the CO2 impact of our service, this includes;

  • Production of our boxes and pots.

  • Delivering and collecting orders.

  • Cleaning pots and boxes.

  • End of life recycling of our pots.

We compare these to the estimated CO2 impact of similar orders where single-use packaging must be thrown away after each use. We assume an average number of reuses for our boxes and pots and factor that into the calculations.

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