while hiking, I use a 2L Camelbak or Platypus w/ hose. I have a 32 oz Nalgene to use for random purposes, like making tea or mixing gatorade type stuff, or to drink from around camp; doubles as a measuring cup or rehydrating container. I have a 2L platy that stands on its own - I get to camp, filter up a couple liters for dinner/breakfast/washing/drinking into the platy and the nalgene, and by the time I'm ready to head out the next morning they're empty and the drinking bladder gets filled. The standing platy is easier to use around camp than the hoser that hangs in the pack and is the backup for the hoser if it ever starts to leak.