Hydration Packs

What are everyone's thoughts about hydration packs on here? I use to have a smaller Camelbak and I thought it was really good, until I found algae that was growing inside the hose that I could not get out. There was also the problem of the water tasting really weird on a hot day, almost like the plastics from the bag would leach into the water. I tried looking at other bags but they all have that same neo-plastic bag inside and the plastics that form the rest of the backpack are too fragile to use any good cleaning products with. I am going to be doing a big hike across the States later this fall so I would like to have some sort of hydration pack with me while doing it so if anyone can suggest a better one that would be greatly appreciated.

So it seems that I was being lazy and did not do enough research as Warpy posted a very good guide to cleaning your hydration packs that seems very thorough. I have checked out some of the hydration packs online, and saw the Motherlode Rucksack being sold by someone on https://www.for-sale.ie/camelbak-motherlode-rucksack and after I met with the buyer and expressed my concerns about cleaning, he actually gave me some little tools he had made (similar to the guide from Warpy) to clean it out with. Thanks for the advice everyone, and thanks to the guy who sold me this for giving me a little extra!