According to Finnish legislation on waste management, biowaste and mixed waste must be placed in a bag. Biowaste must have its own, biodegradable bag; mixed waste can be placed in e.g. regular grocery store plastic bags. The plastic packages should also be placed in a plastic bag.
The waste hatch will only accommodate one bag (with a size of no more than 20 liters) at a time. You can not place any long or large items in the system; they belong in the sorting room.