There are a lot of cheap knock-offs on eBay, this is for an ORIGINAL & AUTHENTIC LifeStraw in the original, unopened manufacturer's packaging.

LifeStraw is an award-winning point-of-use portable water filter that transforms microbiologically contaminated water into safe, clean drinking water. It is ideal for a variety of users outside of the home, from hikers and campers to people displaced by natural disasters.

• Lightweight--only 56 grams (or 2 ounces)
• Uses hollow fibre microfiltration technology
• Purifies a minimum of 1000 litres (264 gallons) of water
• Removes virtually all bacteria (99.9999 percent) and protozoan parasites (99.9 percent) that can contaminate water, including giardia
• Reduces turbidity (muddiness) by filtering particulate matter larger than 0.2 microns
• Made of durable plastic 
• Chemical-free
• Doesn’t require electrical power, batteries or replacement parts–it’s powered by user-generated suction