1. Haum rau cov xwm txheej uas koj yuav tsum tau txav mus los tsis tu ncua lossis tawm mus.
2.Effectively tiv thaiv lub teeb thiab noo noo, yog li ncua lub txee lub neej ntawm cov khoom.
3.Leak pov thawj. Nruab nrog cov kab sib khi los yog cov cuab yeej tshwj xeeb los tiv thaiv kev xau lossis kev sib kis ntawm cov khoom.Visibility, ntau haiv neeg.
4.Suitable rau ntau yam khoom, thiab sib txawv capacitiesand duab tuaj yeem xaiv raws li qhov xav tau.
5. Ib puag ncig tus phooj ywg. Ua los ntawm cov khoom siv rov ua dua tshiab, nws pab txo cov pov tseg yas thiab ib puag ncig muaj kuab paug.
6. Durability. Cov qauv tsim yog tsim nyog, tuaj yeem tiv taus qee qhov siab, thiab tsis yooj yim deformed lossis puas.
7. txuag chaw. Lub tiaj tus tsim siv me me qhov chaw thiab yooj yim rau khaws thiab thauj.
8. Yooj yim los ntxuav. Feem ntau yog ua los ntawm cov khoom siv dej tsis zoo, nws tuaj yeem ntxuav tau yooj yim nrog ib lub tais diav, thiab lwm yam.
9.reusable.