The Platypus is pretty nice for a lightweight primary bladder (along with some of Nalgene's collapsables), but they're still pretty bulky with rolled up. I'm looking for something to basically replace the old condom trick, but a liter capacity. It's has to be super compact for out of the way storage, and put to use in emergencies. Keep a couple in various pockets and packs along with a few Micropur tablets, and forget about them until you have a dire need for some drinking water.

J