Ib tus kheej- lub hnab ntim khoom yog ib hom ntim ntim ntim uas muaj lub siab- qhib, tsis siv neeg sealing tshuab; ntau hom muaj xws li hnab airtight, interlocking- hnab taug qab, thiab hnab zipper.
Cov hnab no-tseem hu ua lub hnab airtight, interlocking-cov hnab ntim, hnab ntim khoom, hnab zipper, lossis hnab "pob txha" (cov lus Askiv suav nrog Ziplock hnab, hnab rov qab, hnab ntim, zipper kaw hnab, thiab hnab pob txha){2}} yog tsim los siv cov txheej txheem uas muaj cov tshuab cua tshuab -Denesyl PE (PE) extrusion (Lowyl PE4) los yog Linear Low-Density Polyethylene (LLDPE), tom qab los ntawm tshav kub- sealing thiab txiav. Lawv yog tsim los ua resealable. Cov khoom siv feem ntau suav nrog PE, PO, thiab EVA, nrog rau ntau- txheej txheej zipper hnab ntim khoom.