Packaging choices involve food protection, transport, shelf life and local recycling systems. A package that looks simple is not automatically lower impact.
Box and liner have different jobs
The cardboard provides structure and printing space; the inner liner protects against moisture and contamination. They may require separate disposal.
Check local rules
Plastic-film collection varies widely. Do not place a liner in household recycling unless your municipality or collection program accepts that material.
Bulk is not automatically better
A larger package can reduce packaging per gram, but only if the cereal is used before it becomes stale. Food waste can erase the advantage.
Reuse without losing information
If transferring cereal to a container, retain the product name, lot code and date until it is finished in case of an allergen question or recall.