I've just bought two Webtex Hydration Pouches to fit my bergen. I already have a Camelbak Unbottle, which is great, but doesn't quite fit in the pouch. From experience, I've found the Camelbak to be much better than the Platypus I used to use, both in quality and function, but I'm also interested in finding out about the bladders made by Gelert. Their Trespass Hydration Bladder looks to be a similar quality to Camelbak, but is much cheaper. What do you guys use?