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1.insulated drinking tube,bite and suck design.2.full opening bag desigh,easy to put hand inside to make cleaning and dry.
3.stable handle for bladder.
4.slide-lock system,get rid of the trouble of rotating traditional switch cover.
5.convenient assembling with backpack:you can put bladder wtih water in bag,then
connect tube with bladder without leaking.
6.quick-link outlet with high-grade seal device to avoid leakage.
