Hana ʻia ka ʻaʻahu waho me ka polyester oxford me ka lole kiʻi TPU. He wai wai kiʻekiʻe. ʻO kekahi e koho i ka uhi polyester i loko, i ka wā e ʻaʻahu ai i ʻoi aku ka ʻoluʻolu, ʻO kekahi aia ka zipper ma mua, a aia kahi pā e uhi ai i ka zipper, hana. ʻO ka ʻaʻahu e ʻoi aku ka wai.