LifeStraw is something that you might have noticed is included in some of the higher end models and is a really innovative piece of technology. This little unit will allow users to drink out of just about any body of water, and all of the toxins are filtered out of the water before it even hits your lips. It does this through a filtration system that is found directly in the unit itself and is able to filter through an impress 1,000 liters of water (or about 264 gallons) before it needs to be replaced. This item not only offers more water than ration packs, but it takes up a lot less room and doesn’t add a lot of weight to your pack.