I roto i te umanga rongoā, he mea tino nui te hiahia mō ngā otinga takai e whakarato ana i ngā taumata tiketike o te tiaki mai i te makuku me te urunga hāora. Ko te whakarite i te pono me te whai huatanga o ngā rongoā tairongo me whai rauemi ka taea te whakarato i ngā āhuatanga ārai pumau. Kua puta ake ngā kapia EVOH (Ethylene Vinyl Alcohol) hei kaitākaro matua i tēnei mara nā tō rātou kaha ki te tiaki i ngā hua mai i ngā āhuatanga taiao e pirau ana.