Here are some items I am thinking of putting together to make a water filter small enough to put in my PSK CamelBak:







The Platypus holds 2+ liters of water. I have one rolled up on the bottom of my CamelBak. I could use it to collect water and then use the Sawer Water Filter to pour filtered water into my CamelBak bag. The filter is good for 500 gallons. It weighs 1.75 oz and is 1.75" x 5.5" long.

What do you guys think?
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Thermo-regulate, hydrate and communicate.