Nā ngā kōpū pet i hangaia ngā momo kai hoki, he iti noa iho ngā whiringa me te whakamahi. I waihanga mai i te PET (Polyethylene Terephthalate), he rauemi korekore rawa, e taea te whakahokia, he torotoro nui, he kino nui, me te tino whakaritorito i roto i ngā momo rūahea. Mōhiohia ko ngā kōpū kaweke waipiro me ngā kōpū pet paihera ki ngā kōpū kai iti. Ko ngā kōpū pet hoki e tino haere ana, e kore e matakaka, ka kitea he pai rawa mō te whakamahi i roto i te pakihi rānei, i runga i te ara.