Reduce the need for "convenience" pre-packaged food by making your own snacks. This article on Kiwi Families' website is a great resource.
Clean chippy packets, for example, can be crafted into baskets, aprons, coasters - there are plenty of craft ideas online.
The Whanganui Resource Recovery Centre is investigating recycling options with Terracycle NZ.
Foil food wrappers and packets do not biodegrade. Please keep from landfill wherever possible.