I was wondering the same thing. I've been using Cabelas brand bladders and Camelbak as well the last 10 years. I think it is time for an upgrade.
This weekend I looked at the Platypus "Big Zip" bladder. I think I will go with this bladder for a couple reasons. #1, the upper end of the bladder zips completely open which will making cleaning it a breeze. This feature is very appealing due to that fact that cleaning has always been a pain in the past. #2, I've been told that they are very durable as well.
Anyone else have any experience with the Platypus Big Zip?