I don't remember the study, but some of the plastic packaging can help to keep the food fresh for longer, and then minimise the loss of food, which is actually one of the main issues with food distribution, so counterintuitively, using plastic packaging can actually alleviate the environmental impact. Plastic is extremely good at doing its job, it's basically impermeable, inert towards food and can last forever (bad thing though).
Is there an alternative to plastic packaging, probably, but l don't know it if it's economical.