I love Hydrapak overall. I've used their reservoirs, bite valves, cleaning products, and water bottles and find them all to be the best on the market. I do have a slight problem with the newer design of these shape shifter bladders. The "improved" opening is so small that I can't hold the mouth of the bladder open far enough to pour water in. The opening is too small for my sink faucet to fit in either. Otherwise, great product.
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