Zosefera za spin pack mu media media ndi mtundu wa zosefera zomwe zimagwiritsidwa ntchito m'mafakitale osiyanasiyana, makamaka popanga ma polima.Yankho likhoza kukhala mafuta, gasi, madzi, mafuta, madzi, polima kapena mtundu uliwonse wa madzi oyenda pa kutentha kulikonse.Zimakhala ndi waya wachitsulo mesh kapena chophimba chomwe chimalungidwa mu mawonekedwe aliwonse, monga cylindrical, rectangular, square, oval shape kapena ena.Fyuluta ya paketi iyi imayikidwa muzosefera kuti ichotse zonyansa ndi tinthu tating'ono mu yankho.Zofalitsa zachitsulo zimapereka mphamvu zambiri komanso zolimba, zomwe zimalola kuti fyulutayo ikhale ndi kutentha kwakukulu ndi kupanikizika.