Hi every one, So im new to this site but have been reading a lot lately trying to get ready for my first over night trip. The question I have is in regards to water purification. Is a water filter better or a steri pen better. Is one more effective then the other? Do steri pens actually work? Im also looking into buying a pack. I read a lot on how new hikers always carry to much so how do I avoide this? What size pack should I get for weekend and hopefully some week long trips. Probally wouldent be going for any longer then that at this point. Thanks for all future advice