Qhov txuas no muaj ob hom lub hnab (yim-sided foob, lub hnab txhawb nqa tus kheej).Ob hom hnab no yog cov nyiam tshaj plaws ntawm cov hnab ntim khoom noj.Lawv tau txais ntau yam cuab yeej sib xyaw thiab sawv ntsug, uas yog qhov tsim nyog rau cov khoom txee thiab ua rau cov khoom lag luam zoo nkauj dua.Nws zoo li qib siab thiab tseem ceeb, nrog cov nyhuv sealing zoo.
Lub hnab nrog zipper tuaj yeem muab ntim rau rov siv dua.