Compostable Bags

At Prima Roastery we believe in taking responsibility for the effects of our business on the environment. Back in 2011 we worked with New Zealand packaging company Convex to develop the worlds first compostable coffee packaging and we have been using it ever since.

Our bags are made from 3 different compostable films certified to the European standard - En13432.

These films are produced from sustainably-produced wood pulp and GM-free corn sources and will break down in a composting environment containing heat, water, soil, oxygen and micro-organisms. This generally takes around 14 weeks but can be longer or shorter depending on the composting conditions.

At the moment these bags have 97% compostable components. We are looking at utilising renewable resource-based inks and adhesives in the future to increase the overall compostable components.

The degassing valve on these bags is not compostable and can be easily peeled off before composting.
For more information visit

Commercial Collection

Few councils nationwide are accepting anything other than food and garden waste in it's residential greenwaste collections. We expect with the wider adoption of compostable packaging options that this will begin to change.

In the meantime there are some private commercial collection companies accepting and composting these materials. Get in touch with your local providers to find out what compostable materials they will accept.

Please don't put our packaging or any other compostable packaging items in your local greenwaste collection without being certain they are suitable and can be accepted.

Home Composting

We encourage home composting as an end-of-life option for this packaging. There is a lot science behind efficient commercial hot composting, but it doesn't have to be complicated to get a good hot compost pile going at home.

A couple of quick tips:

When choosing your spot and designing your pile, look for somewhere with good airflow, drainage and minimal temperature extremes i.e. not too damp and dark or too dry and sun scorched.

Think about building your pile high not wide. Bins are a great option
Good compost piles require sources of both carbon and nitrogen. Nitrogen comes from green materials like food scraps, grass clippings, manure and of course, coffee grounds. Carbon comes from brown materials like dead leaves, hay, wood chips or compostable packaging.

Aim for a 50/50 mix of greens and browns by weight.

When building your pile, shred anything large into smaller pieces and mix your greens and browns together (or layer thinly).

Turn your pile every couple of weeks. Focus on aerating and rebuilding the pile high. This is also when you get to see if the centre of the pile is hot. If it is, great! If not, adjust things and try again.
It can help to keep your pile covered and even weighted down in the beginning.

There are a few things that many people avoid composting (meat, eggs, dairy, weeds etc) but once you've got a good hot pile going you would be amazed what you can process. Start slowly but don't be afraid to experiment.

And don't stress, even if you make a few mistakes and it's going slow, eventually you will get compost.

Bring it to us

We have been experimenting with a return model for our packaging, taking the responsibility for the effects of our business on the environment a step further as well as helping some of our clients build environmental awareness into their business models.

So, if commercial collection or home composting aren't an option for you, our bags can be returned to us for composting on our little farm in Leeston.

We have a drop off point at our roastery in Woolston; otherwise please contact us to discuss whether efficient transport is possible.