The straps are mesh and therefore do not generate excessive sweating. Aluminum lined layer insulates the back of the pocket of water, maintaining the freshness of the water. It has two pockets, one closes with zip. Its capacity of 2 liters of water (checked) is a definite plus. It remains well maintained even mountain biking. Finally, the nipple is very well play its part. Only complaint: the closure of the water tank. This is not the most practical because we are not here in the presence of a single screw cap such as that one can usually see this kind darticle. It is done in farm via two systems: a zip like "Ziplock freezer bags" and dune clip just secure everything. While sealing issue, we can not do better I think, but to fill, it's not that. On the other hand, the material of the pocket is not rubber / silicone, but not very flexible plastic that risk, I think, to crack with age. At that time, just to buy a more classic pocket. To see. Last reserves, plastic pipe that serves as the "bottle" gives a strong odor to the water. To see in time