Ibicuruzwa bikozwe mubipapuro byubukorikori na Mylar. Nanone bita imifuka y umusego, imifuka ifite inyuma, hejuru no hepfo, kuburyo bifite imiterere y umusego, imifuka mito mito y'ibiryo bakunze gukoresha imifuka y umusego kugirango bapakire. Isakoshi yo gufunga inyuma nuburyo busanzwe bwo gupakira kumifuka yubwoko bwose bwibiryo. Irasa murwego rwohejuru kandi igaragara, hamwe ningaruka nziza yo gufunga.