Thanks @rizasukma!
Yes, plastic is a wonderful material too, it's easy to form and is durable, but while it can be recycled, most is unfortunately thrown into landfills or the ocean and it doesn't simple biodegrade like paper.

There is a great reusing/recycling project called Precious Plastic which aims to give the tools, knowledge and support to small businesses and individuals to start recycling plastic by themselves! I should make a post about that, I'm somewhat interested in seeing what kind of interest there would be to start such a recycling business.

Using cardboard from the start, while not suitable for all purposes, can greatly help the environment.