4..Ikirango cya SBS zipper, ikomeye ya suture ebyiri, igitugu cyigitugu gishimangirwa na suture ya mpandeshatu, epfo na ruguru ishimangiwe ni umutekano kurushaho.Inzira idasanzwe yo gusiga irangi yemeza ko igikapu gishobora gukoreshwa igihe kirekire kidacogoye.