Was a Camelbak fan for years, still am of their packs but not so much for their reservoirs. Busted one up and went with Platypus instead; zip top, carry handle, lighter. However I have found recently that even sipping every ten minutes I still do not get enough water in me for my requirements and get dehydrated long term in the day.

I now use Nalgene bottles when ever I can, I can easily monitor how much I take in. Two on me plus a 2 liter platypus platy-bottle in my pack. With 2x 30 oz Nalgenes and 1x 30-60 oz platy-bottle I carry as much as 100 oz hydration reservoir but drink better.