[Savage Beast]

This is the first I have heard of this, but it appears to be very interesting.

Note: It does not remove viruses. Hepatitis and other dangerous diseases are caused by viruses.

It also does not remove chemicals.

Nevertheless, it could be very useful under certain circumstances, such as survival scenarios.

This is what I found here: http://eartheasy.com/lifestraw?gclid=CMb56t-W6rICFQgGnQodyBkAoQ

LifeStraw Personal Water Filter

ITEM #: LSPHF017
List price: $22.95
Our price: $19.95

Please note: The LifeStraw currently does not filter heavy metals or viruses, and will not desalinate water.

[PanzerKardinal]

The Lifestraw Family model will filter down to 20 nanometers, which is smaller than most viruses.

[dangus]

Aha, apparently the small, individual lifestraws do not remove viruses, but the larger LifeStraw Family does.