How about the Hydration pack? it is very cool, isn't it? we could drink without need to stop in athletic sports, climbing or other activity, it will save alots times, also we could drink any time any where.
How about the Hydration pack design? It is like the other backpack, just additional a bladder in side of the backpack with a mouth piece. usually the bladder could be 1.5L-3L, the size of the backpack will depends on the capacity of the bladder. The popular material of the bladder is 0.3mmTPU, it is durable and safe, we could rest assure to drink the water from the bladder.
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