Package design is, ultimately, designing what will definitely become trash. Reduce the amount of material used, or if impossible, consider turning everything into the same mateirial.

Packaging made out of only one type of material throughout make it much easier for the user to recycle their trash. Pure PET bottles without sleeves, 100% paper cup noodles container, cardboard box without glue, shampoo refill packet without cap. If no protection needed, go for tags and stickers! ♻️🌍