The Lifesaver Bottle looks like a neat piece of gear, but it cleans about 1,300 gallons. The Katadyn Pocket is good for 13,000 gallons. That's ten times the water for about I think the extra price makes up for this. Not is only the price per gallon much better with the Katadyn, but you have to take the Lifesaver apart and fill it up about a liter at a time. The Katadyn Pocket can be continually pumped until whatever water vessel you are using is full and is much faster at it.

If you buy the Endurance Lifesaver pack, you get about the same water filtering capacity as the Katadyn at more than twice the price and you have to carry 16 spare filters.