This survival water filter makes a great addition to any survival bag. It's small and compact so it won't take up too much space. It filters water quickly and easily without much effort. It takes just a few seconds to put the cords on and it's reading to be used. They even sell replacement filters and parts online if you use it and need to replace them. I purchased this water filter at a discounted rate so that I could provide an honest and unbiased review. It's very high quality and a must for any survival bag.

http://www.amazon.com/Survivor-Filter-Attachable-Contaminants-Preparedness/dp/B00QFXGSIY/ref=cm_cr-mr-title