Rating: 2 / 5
Recently (7/5/13) I purchased a Rush 14L daypack from Golite, which came with a 3L Hydrapak bladder. The bladder is very supple, and would seem like a potential alternative to the Platypus, except for the pronounced taste it imparts to the water, which I can only describe as "acrid." Emailed Golite, and their rep acknowledged the problem, and suggested I fill the pack with a solution of baking soda and lemon juice in water, which he said would release lots of oxygen and remove the taste. In fact his chemistry was completely wrong. What's released is CO2, making a weak solution of carbonic acid. The off taste did diminish somewhat, initially, but returned with increasing potency the longer water sat in the bladder. Googled HydraPak and called them, and their rep acknowledged the taste and said it was just the taste of the plastic. He suggested freezing the bladder with a weak lemon juice solution.
But of course, plastic has no taste unless some component of the plastic, or some residue of its manufacture, is leaching into the water. May be harmless, but no one I spoke with was able to identify the source of the taste chemically. The Golite rep said the plastic had no BPA or PVC (he probably meant PCB), but of course, there are lots of other bad chemicals out there.