The SteriPEN handheld water purification System, contains all the tools you will need to optimize your water purification: The SteriPEN Classic handheld water purifier, 32 oz. Water Bottle, Water Bottle Pre-Filter, user"s guide and case. Add your choice of 4 AA batteries (we strongly recommend Lithium or NiMH) and you are ready to provide safe drinking water anywhere. This convenient solution has been well received by people who want a good value and a full range of options for pre-filtering situations like leaves or glacial silt preventing clear water. (See Product Demonstration Video)