Sustainability is very important to us, which is why we have designed the brewers in a way that makes them reuseable. To reuse the coffeebrewer simply empty out the used coffee grounds after the first use, rinse the bag, and refill it with your own coffee grounds. The coffeebrewer can be reused many times, but it is important to avoid getting the outside kraft paper wet. The teabrewer and herbbrewer can be reused in the same way. However, the tea blends are so flavourful that you can actually brew on the same tea 2-3 times before rinsing out the bag. The brewers are made from environmentally friendly kraft paper, a very thin plastic lining and a plastic spout. The choice of material is comparable to a milk carton, and disposal of the material should be done accordingly.